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Photoisomerization and its effect in the opto-electronic properties of organic photovoltaic materials: A quantum chemistry study
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier BV
Yazar(lar) :
Cornelio Delesma , Carlos Amador-Bedolla , Miguel Robles , Jesús Muñiz
Yıl :
2021
Journal of Photochemistry and Photobiology A: Chemistry
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A density functional theory study was performed on a series of organic photovoltaic materials with a promising potential to be implemented as the active layer in a solar cell device. A thorough analysis on the molecular structure at ground and excited state revealed that some of the systems in the series of molecules observed in the ground state is dramatically altered in the first excitation. The dihedral deviations could be addressed as a ruling mechanism behind isomerization and its influence in the opto-electronic properties. The computation of absorption spectra at ground and excited state geometries showed a significant shift in the absorption maxima, presumably due to such geometrical changes. Furthermore, the computation of dipole moments gave us insights into the possible charge transfer from the OPV material to an acceptor in a solar cell device. This is critical when the system is implemented in such a device. Additionally, relevant photovoltaic parameters were collected, and a candidate series of OPV systems was proposed as potential materials for the heterojunctions of a solar cell device. The given theoretical methodology and the photovoltaic data computationally obtained may aid in the in silico design of novel donor materials for the new generation of solar cells.
DOI : 10.1016/j.jphotochem.2021.113155
Anahtar Kelimeler : Density functional theory, Organic photovoltaic, Photoisomerization, Excited state
ISSN: 1010-6030
Cilt: 409
Sayfa: 113155
2
Deconstructing experimental rate constant measurements: Obtaining intrinsic reaction parameters, kinetic isotope effects, and tunneling coefficients from kinetic data for OH+methane, ethane and cyclohexane
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Amy M. Sage , Neil M. Donahue
Yıl :
2005
Journal of Photochemistry and Photobiology A: Chemistry
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Kinetic data for multiple OH–alkane reactions, including primary kinetic isotope data, can be fit simultaneously to extract constrained contributions from transition state vibrational activation, zero-point energy, and tunneling. We use data for single-pathway reactions: OH + methane, ethane, and cyclohexane, to obtain optimal ‘intrinsic’ parameters common to all reactions. This is possible because parameters specific to individual reactions, such as the pre-exponential term, can be accurately calculated with ease. Several intrinsic parameters – the barrier height, the tunneling temperature (imaginary frequency) and a transition state bending frequency (the radical attack angle) – scale together from reaction to reaction. This scaling is so precise that we can accurately fit data for OH + methane using intrinsic parameters derived for OH + ethane and OH + cyclohexane using only a single free parameter (the scaling factor). This strongly confirms our underlying hypothesis about the physics controlling the key transition state parameters and suggests that extrapolations in temperature and predictions for unmeasured reactions are potentially robust.
DOI : 10.1016/j.jphotochem.2005.09.011
Anahtar Kelimeler : Hydroxyl radical, Alkanes, Reactivity control, Kinetic isotope effects
ISSN: 1010-6030
Sayı: 1-3
Cilt: 176
Sayfa: 238-249
Sınıflandırma :
Kimya %100
Organik Kimya %62
3
Application of cyclometalated rhodium(III) complexes as therapeutic agents in biomedical and luminescent cellular imaging
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier BV
Yazar(lar) :
Marzieh Sohrabi , Maryam Bikhof Torbati , Martin Lutz , Soraia Meghdadi , Hossein Farrokhpour , Ahmad Amiri , Mehdi Amirnasr
Yıl :
2021
Journal of Photochemistry and Photobiology A: Chemistry
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The synthesis and characterization of three [Rh(ppy)2(N^N)][PF6] complexes, [Rh(ppy)2(pybtz)][PF6].CH3OH (Rh1), [Rh(ppy)2(pzbtz)][PF6] (Rh2) and [Rh(ppy)2(qbtz)][PF6] (Rh3) [Hppy: 2-phenylpyridine; N^N: (pyridin-2-yl)benzo[d]thiazole (pybtz), (pyrazin-2-yl)benzo[d]thiazole (pzbtz), and (quinolin-2-yl)benzo[d]thiazole (qbtz)], and single crystal structures of Rh1 and Rh3 are reported. Rh1 and Rh3 show high fluorescent intensities upon excitation at 400 and 410 nm, respectively. Evaluation of lipophilicity by theoretical calculations indicates Rh3 > Rh1 > Rh2, introducing Rh3 as the best candidate for biological studies. The Rh3 exhibits anticancer activity, with high cellular uptake efficiency and good cytotoxicity against MCF-7 cell line as compared to the non-malignant MRC-5 cells. Flow cytometry have confirmed the apoptosis cell death and cell cycle arrest in the sub-G1 phase. The result of real time PCR shows that Rh3 induces apoptosis by up-regulating of p53, miR-15a, miR-16–1 and miR-29b and down regulating of bcl-2 and miR-21 at the level of RNA transcription. Importantly, cell imaging experiments have demonstrated that Rh3 can be considered as a new promising metallodrug candidate for cancer treatment.
DOI : 10.1016/j.jphotochem.2021.113573
Anahtar Kelimeler : ppy phenylpyridine, phenylpyridine, bpy bipyridine, bipyridine, pybtz (pyridin-2-yl)benzodthiazole, (pyridin-2-yl)benzodthiazole, pzbtz (pyrazin-2-yl)benzodthiazole, (pyrazin-2-yl)benzodthiazole, qbtz (quinolin-2-yl)benzodthiazole, (quinolin-2-yl)benzodthiazole, MLCT Metal to ligand charge transfer, Metal to ligand charge transfer, SCE saturated calomel electrode, saturated calomel electrode, HOMO highest occupied molecular orbital, highest occupied molecular orbital, LUMO lowest unoccupied molecular orbital, lowest unoccupied molecular orbital, MCF-7 Michigan cancer foundation-7l, Michigan cancer foundation-7l, MTT 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide, 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide, DNA deoxyribonucleic acid, deoxyribonucleic acid, IC50 half maximal inhibitory concentration, half maximal inhibitory concentration, bcl-2 B-cell lymphoma 2, B-cell lymphoma 2, p53 gene of P53 protein, protein, miRNA micro ribonucleic acid, micro ribonucleic acid, ESI Electronic Supplementary Information, Electronic Supplementary Information, Cyclometalated, Rh(III) complexes, Cell cycle, Cell-imaging, Theranostic agents
ISSN: 1010-6030
Sayfa: 113573
4
Drastic changes in the fluorescence properties of NBD probes with the polarity of the medium: involvement of a TICT state?
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Suzanne Fery-Forgues , Jean-Pierre Fayet , André Lopez
Yıl :
1993
Journal of Photochemistry and Photobiology A: Chemistry
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The spectroscopic and photophysical properties of two 7-nitrobenz-2-oxa-1,3-diazol-4-yl (NBD) derivatives with different substituents on the nitrogen group are reported in 18 solvents. The solvatochromic shifts were analysed by correlating with polarity scales. The results, together with the help of modified neglect of diatomic overlap (MNDO) calculations, enable the polarity of the ground and first singlet excited states to be determined. Experiments based on variations in temperature and viscosity establish that the two probes undergo different de-excitation pathways. The possibilities of internal rotation leading to a twisted intramolecular charge transfer (TICT) state in the case of diethylamino-NBD are discussed. A study in binary solvent mixtures outlines specific solvent—solute interactions. Appropriate restrictions are emphasized on the utilization of NBD probes in biological fields.
DOI : 10.1016/1010-6030(93)85048-d
ISSN: 1010-6030
Sayı: 3
Cilt: 70
Sayfa: 229-243
Sınıflandırma :
5
Photodegradation of sodium naproxen and oxytetracycline hydrochloride in aqueous medium using as photocatalysts Mg-Al calcined hydrotalcites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
G. Jácome-Acatitla , F. Tzompantzi , R. López-González , C. García-Mendoza , J.M. Alvaro , R. Gómez
Yıl :
2014
Journal of Photochemistry and Photobiology A: Chemistry
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Layered double hydroxides (LDH) MgAl with different MII/MIII ratios were synthesized by the co-precipitation method. The materials were calcined at 723 K and characterized by XRD, nitrogen adsorption, UV–vis DRS and FTIR. The catalytic activity of the calcined solids was tested in the photodegradation of two water soluble pharmaceuticals: sodium naproxen, a non-steroidal anti-inflammatory, and oxytetracycline hydrochloride, a tetracycline family antibiotic. The synthesized solids mineralize rapidly both pharmaceuticals using UV as light source and after 5 h of reaction, about 90% of sodium naproxen and 70% of oxytetracycline hydrochloride were degraded by the catalyst with the higher photoactivity. Comparative studies were performed with TiO2 P25 commercial semiconductor. The results showed that the MgAl calcined hydrotalcites have a greater photoactivity in the degradation of the target molecules than TiO2. Fluorescence spectroscopy study suggests the generation of hydroxyl radicals as the oxidative species of the target molecules when MgAl calcined hydrotalcites are irradiated.
DOI : 10.1016/j.jphotochem.2013.12.014
Anahtar Kelimeler : MgAl calcined LDHs, Sodium naproxen photodegradation, Oxytetracycline hydrochloride photodegradation, Sodium naproxen TOC analysis, Oxytetracycline TOC analysis, Fluorescence probe
ISSN: 1010-6030
Cilt: 277
Sayfa: 82-89
Sınıflandırma :
6
Study on premicellar and micellar aggregates of gemini surfactants with hydroxyl substituted spacers in aqueous solution using a probe showing TICT fluorescence properties
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Amit K. Tiwari
Yıl :
2011
Journal of Photochemistry and Photobiology A: Chemistry
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The aggregation properties of two gemini surfactants, 12-3(OH)-12,2Br− and 12-4(OH)2-12,2Br− with hydroxyl substituted spacer group have been studied. The changes in photophysical properties of a single probe, trans-2-[4-(dimethylamino)styryl]benzothiazole (DMASBT) showing dipolar nature in its twisted intramolecular charge transfer (TICT) excited state have been exploited rather than using multiple probes to describe various properties of micellar aggregates. Formation of a number of premicellar aggregates has been demonstrated in addition to the description of the micropolarity and the microviscosity of environment using steady-state fluorescence spectroscopy and fluorescence anisotropy of DMASBT. Conductometric measurements have been carried out to determine degree of micellar ionization (α) and to verify critical micelle concentration (CMC) values estimated by fluorescence method. Hydroxyl substituted spacer group induces the formation of premicellar aggregates. The micropolarity of environment around probe molecules increases on going from premicellar to micellar aggregates. The growth of micellar aggregates has been demonstrated by a continuous increase in the microviscosity of environment. The micropolarity of micellar environment of 12-4(OH)2-12 is found to be less than that of 12-3(OH)-12. The microviscosity of premicellar and micellar aggregates of 12-4(OH)2-12 are higher than that of 12-3(OH)-12. CMC increases, whereas α decreases with increasing spacer chain length as well as number of hydroxyl substitution of a spacer group.
DOI : 10.1016/j.jphotochem.2011.07.009
Anahtar Kelimeler : DMASBT, Gemini surfactant, TICT fluorescence, Premicellar aggregation, Micropolarity, Microviscosity
ISSN: 1010-6030
Sayı: 1
Cilt: 223
Sayfa: 6-13
Sınıflandırma :
7
Influence of the sodium/proton replacement on the structural, morphological and photocatalytic properties of titanate nanotubes
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
V. Bem , M.C. Neves , M.R. Nunes , A.J. Silvestre , O.C. Monteiro
Yıl :
2012
Journal of Photochemistry and Photobiology A: Chemistry
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Titanate nanotubes (TNTs) with different sodium contents have been synthesised using a hydrothermal approach and a swift and highly controllable post-washing processes. The influence of the sodium/proton replacement on the structural and morphological characteristics of the prepared materials was analysed. Different optical behaviours were observed depending on the Na+/H+ samples’ content. A band gap energy of 3.27 ± 0.03 eV was estimated for the material with higher sodium content while a value of 2.81 ± 0.02 eV was inferred for the most protonated material, which therefore exhibits an absorption edge in the near visible region. The point of zero charge of the materials was determined and the influence of the sodium content on the adsorption of both cationic and anionic organic dyes was studied. The photocatalytic performance of the TNTs samples was evaluated in the rhodamine 6G degradation process. Best photodegradation results were obtained when using the most protonated material as catalyst, although this material has shown the lowest R6G adsorption capability.
DOI : 10.1016/j.jphotochem.2012.02.002
Anahtar Kelimeler : Titanate nanotubes, Sodium/proton exchange, Band gap energy, Photocatalysis, Rhodamine 6G
ISSN: 1010-6030
Cilt: 232
Sayfa: 50-56
Sınıflandırma :
8
Development of a novel fluorescent probe for Zn2+/Cu2+/S2− in different solutions based on benzocoumarin derivative
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Cong Liu , Jing-can Qin , Jia Xue , Li-mei Tian , Tian-rong Li , Zheng-yin Yang
Yıl :
2019
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
2’-hydroxynaphthalene-1’-methylidene-5,6-benzocoumarin-3-imine (L) has been developed as a novel multifunctional fluorescent probe based on benzocoumarin derivative for the detection of Zn2+, Cu2+ and S2−. The fluorescence of L enhanced after adding Zn2+ in acetonitrile while the fluorescence quenched with the addition of Cu2+ in ethanol/water solution (9/1, V/V). Surprisingly, fluorescence recovery was appeared after adding S2− to L-Cu2+.
DOI : 10.1016/j.jphotochem.2019.112091
Anahtar Kelimeler : Multifunctional, Fluorescent probe, Benzocoumarin derivative, Fluorescence recovery
ISSN: 1010-6030
Cilt: 385
Sayfa: 112091
Sınıflandırma :
9
Wavelength-dependent photolysis of 3-vinyl-phenyl- azosulphonate
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
D. Franzke , B. Voit , O. Nuyken , A. Wokaun
Yıl :
1992
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
The photochemical decomposition of 3-vinyl-phenyl-azosulphonate (II) in aqueous solution was investigated by pulsed UV laser irradiation. Photolysis at 308 nm results in a complex reaction proceeding via more than one intermediate. In the final products identified by gas chromatography—mass spectroscopy analysis, the azosulphonate group of II is replaced by a hydroxyl group, and the vinyl group is saturated by the formal addition of a molecule of water. Further hydroxyl groups are introduced on the aromatic ring in other products. Pulsed dye laser irradiation at 370 or 390 nm results in a different behaviour. The parent compound is first converted into an intermediate (X) characterized by an absorption maximum at 272 nm. The latter species may be further decomposed into the final products by subsequent irradiation at 308 nm. A reaction scheme accounting for these observations is proposed, and the identities of the various intermediates are discussed.
DOI : 10.1016/1010-6030(92)85184-v
ISSN: 1010-6030
Sayı: 2
Cilt: 68
Sayfa: 205-212
Sınıflandırma :
10
Dye-sensitized oxidation of tetramethylpiperidines (HALS) to N-oxyls
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Monika G. Hepp , Horst E.A. Kramer
Yıl :
1994
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
Flash photolysis and electron paramagnetic resonance (EPR) measurements show that, at high concentrations (1.28 M in methanol, pMH 11.3) of 4-hydroxy-2,2,6,6-tetramethylpiperidine (HTEMP, hindered amine light stabilizer, HALS), the oxidation product 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPOL) is formed according to a type I (radical) mechanism (and not via the competing type II (singlet oxygen) photo-oxygenation mechanism) when the dyes 3-methyllumiflavin and thionine are used as sensitizers. These dyes exhibit high electron affinity in photoreactions.
DOI : 10.1016/1010-6030(93)03713-q
ISSN: 1010-6030
Sayı: 1
Cilt: 78
Sayfa: 19-29
Sınıflandırma :
11
Excited state intramolecular proton transfer emission in bent core liquid crystals
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Ashok K. Satapathy , Santosh Kumar Behera , Rajeev Kumar , K.L. Sandhya , C.V. Yelamaggad , Balaram Sahoo
Yıl :
2018
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
We report the photophysics of two bent-core liquid crystals (BLCs), C56H67NO9 (BLC1) and C55H65NO9 (BLC2), containing a Schiff-base and two long alkyl chains at its two ends. The ground state dipole moment and the electronic structures of the BLCs were calculated using density functional theory (DFT). The dipole moments of the liquid crystals were estimated experimentally via solvatochromic shift of the absorption and fluorescence spectra. The dipole moments obtained experimentally are in quite good agreement with theoretically calculated values. In the fluorescence spectra of both the BLCs show an interesting feature, i.e., dual emission. This dual emission is explained via the presence of two tautomeric forms (keto and enol) of the BLCs in the excited state. The band at ∼390–450 nm is assigned to the emission due to the keto-form, whereas the band at ∼340–370 nm is due to the emission from the enol-form. Irrespective of the solvents used, the keto-band is more intense than the enol-emission-band. This intense emission from the keto-form of the tautomers is demonstrated via the excited state intramolecular proton transfer (ESIPT). From the time resolved fluorescence spectroscopy studies, a longer lifetime is obtained for the keto-band. The associated vibrational states observed in the emission spectrum are responsible for this longer lifetime. Our finding of the dual emissive nature of the liquid crystals in the visible range is potentially useful for high temperature liquid crystal display and sensing applications.
DOI : 10.1016/j.jphotochem.2018.03.022
Anahtar Kelimeler : Liquid crystal, Dual emission, Solvatochromism, ESIPT
ISSN: 1010-6030
Cilt: 358
Sayfa: 186-191
Sınıflandırma :
Kimya %100
Organik Kimya %96
12
A study on dye photoremoval in TiO2 suspension solution
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Zheng Shourong , Huang Qingguo , Zhou Jun , Wang Bingkun
Yıl :
1997
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
TiO2 samples with different characteristics and adsorption ability were prepared via hydrolysis of titanium tetraisopoxide and calcination at four different temperatures. The photoremoval of Acid Red 3B catalyzed by these catalysts was carried out. The results show high firing temperature lead to large TiO2 particle and a low adsorption ability of TiO2. The dye photoremoval reaction fits zero order kinetics well in catalyst-free solution and changes to first order kinetics in the presence of TiO2. The solution pH value has a large effect on the removal efficiency. High dye removal efficiency can be obtained at high pH value. Catalyst addition improves the dye photoremoval efficiency and leads to the change of removal kinetics. Anatase TiO2 fired at 400 °C shows the best catalytic activity and the catalytic activity of TiO2 fired at 800 °C, which is rutile, is the worst of all catalysts. The catalytic ability of TiO2 is influenced mainly by two factors of catalysts: crystalline form and adsorption ability for Acid Red 3B. The crystalline form is a more important factor influencing the catalytic activity than the adsorption ability of TiO2 and the catalytic activity can be enhanced by the high dye adsorption ability of TiO2.
DOI : 10.1016/s1010-6030(97)00014-2
Anahtar Kelimeler : Photoremoval, TiO2, Catalytic ability, Firing temperature, Kinetics, Adsorption, Crystalline form
ISSN: 1010-6030
Sayı: 2-3
Cilt: 108
Sayfa: 235-238
Sınıflandırma :
13
Photo-isomerisation, triplet formation, and photo-degradation dynamics of indocyanine green solutions
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
H. Gratz , A. Penzkofer , C. Abels , R.-M. Szeimies , M. Landthaler , W. Bäumler
Yıl :
1999
Journal of Photochemistry and Photobiology A: Chemistry
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Indocyanine green sodium iodide (ICG-NaI) in dimethylsulfoxide (DMSO), methanol, water, and human plasma is excited with a chopped powerful diode laser at 812.5 nm (time resolution 20 μs). Small transmission changes observed are analysed in terms of triplet formation, photo-isomerisation, photo-degradation, and thermal heating. Quantum yields of P-isomer formation and T1-triplet formation as well as P-isomer and T1-triplet lifetimes are determined. For nitrogen-bubbled ICG-NaI in DMSO a quantum yield of triplet formation of φT ≈ 5 × 10−5 and a triplet-state lifetime of τT ≈ 700 μs are determined. For ICG-NaI in methanol a quantum yield of P-isomer formation of φP ≈ 2.4 × 10−4 and a P-isomer lifetime of tP ≈ 430 μs are obtained.
DOI : 10.1016/s1010-6030(99)00174-4
Anahtar Kelimeler : Indocyanine green, Dimethylsulfoxide, Human plasma, Intersystem crossing, Triplet quantum yield, Triplet lifetime, Photo-isomerisation, Photo-degradation, Photoisomer lifetime, Heating effects
ISSN: 1010-6030
Sayı: 1-3
Cilt: 128
Sayfa: 101-109
Sınıflandırma :
14
Editorial Board
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yıl :
2013
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
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Kaydet Alıntıla
DOI : 10.1016/s1010-6030(13)00146-9
ISSN: 1010-6030
Cilt: 259
Sayfa: ii
Sınıflandırma :
15
Photodegradation of TiO2 composites based on polyesters
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Simone Sullalti , Grazia Totaro , Haroutioun Askanian , Annamaria Celli , Paola Marchese , Vincent Verney , Sophie Commereuc
Yıl :
2016
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
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Kaydet Alıntıla
The knowledge of the photodegradation mechanisms and the possibility to modify them is a very important topic, especially for the novel biopolymers, as their durability with respect to the petro-plastics is yet an open question. Among the biopolymers, aliphatic polyesters are an emerging class of materials, thanks to the possibility of preparing them from renewable resources and their potential environmental degradability. In this study two aliphatic molecular structures, containing 1,4-cyclohexylene units, have been used: poly(butylene 1,4-cyclohexanedicarboxylate) (PBCHD) and poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) (PCCD). Moreover, in order to increase the durability, titanium dioxide (TiO2), known for its capability of absorbing UV radiation, was incorporated into the polymer. Therefore, composites containing different amount of titania, in the anatase and rutile crystalline phases separately, have been prepared by using a Brabender mixer. Both matrixes and composites were exposed to UV irradiation in an accelerated photo-ageing device and the modifications in their chemical structures were analysed by UV and IR spectroscopies. It results that the photodegradability of PBCHD, containing only one cycle per repeating unit, is lower than that of PCCD and that the composites have a photodegradability lower than those of the homopolymers. The well dispersion of the particles and the good adhesion between TiO2 and polymer have been checked by SEM observations. The protection of TiO2 against the photooxidation increases with the particle content and results higher for the anatase crystalline phase.
DOI : 10.1016/j.jphotochem.2015.11.007
Anahtar Kelimeler : Photodegradation, Biocomposites, Anatase, Rutile, Dispersion, Interaction filler/polyester
ISSN: 1010-6030
Cilt: 321
Sayfa: 275-283
Sınıflandırma :
Kimya %66
Kataliz %58
16
Photochemistry of bis3-(hydroxylamino)-3-methyl-2-butanone-oximato-(2−)-N,N'nickel in CCl4-containing solutions
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
V.F. Plyusnin , E.P. Kuznetzova , I.V. Khmelinski , V.P. Grinvin , V.N. Kirichenko
Yıl :
1992
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
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Kaydet Alıntıla
Laser pulse photolysis was used to show that, for the title complex (Ni(RNO)2) in halogen containing hydrocarbons, the primary process is electron transfer from the excited complex to the solvent molecule. For CCl4, the resulting radical anion CCL4−4 dissociates to the radical CCl3 and the ion Cl−. Some CCl3 radicals escape into the solvent bulk and react with either the initial complex Ni(RNO)2 or oxygen. Other CCl3 radicals exchange charges with the complex Ni3+(RNO)2 to form the complex (RNO)2Ni2+ ..Cl−CCl3+. This species disappears via a second-order reaction. The spectral parameters of the species and their kinetic characteristics are reported.
DOI : 10.1016/1010-6030(92)85194-y
ISSN: 1010-6030
Sayı: 3
Cilt: 63
Sayfa: 289-301
Sınıflandırma :
17
The surfactant concentration-dependent behaviour of safranine T in Tween (20, 40, 60, 80) and Triton X-100 micellar media
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Kamala Rani Acharya , Subhash C. Bhattacharya , Satya P. Moulik
Yıl :
1997
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
The visible and fluorescence spectra of the dye safranine T were studied in micellar solutions of non-ionic surfactants in different concentration ranges. The complexing strengths (1 : 1 dye : micelle charge transfer complex formed between the dye and micelle) of the non-ionic micelles increase with increasing concentration of the surfactant in the micellar solution. The aggregation number and several solvent parameterss, i.e. the Kosower z value, intramolecular charge transfer energy ET30, dielectric constant of the micellar medium and viscosity of the micellar solution, were evaluated. These values remain constant over certain concentration ranges, but vary in different concentration regions of a surfactant.
DOI : 10.1016/s1010-6030(97)00110-x
Anahtar Kelimeler : Absorbance, Aggregation number, Fluorescence, Safranine T, Solvent parameters, Tweens
ISSN: 1010-6030
Sayı: 1
Cilt: 109
Sayfa: 29-34
Sınıflandırma :
18
New Baeyer—Villiger rearrangement products in the addition of singlet oxygen to furfuryl acetate and furfuryl benzoate
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Yueh-Hsiung Kuo , Kae-Shyang Shih , Shu-Mei Lee
Yıl :
1988
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
Sensitized photo-oxygenation of furfuryl acetate gave five products in ethanol and seven products in acetone. Sensitized photo-oxygenation of furfuryl benzoate yielded six products in both ethanol and acetone. Two of these products are new Baeyer—Villiger rearrangement products. This is the first time that these two compounds have been found in the photo-oxygenation of furans. The elucidation of the structures of these products and the mechanism of their formation are discussed.
DOI : 10.1016/1010-6030(88)80119-9
ISSN: 1010-6030
Sayı: 1
Cilt: 45
Sayfa: 97-107
Sınıflandırma :
Kimya %100
Organik Kimya %98
19
Mechanism of chlorine dioxide photodissociation in condensed media
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
M.A. Brusa , L.J. Perissinotti , M.S. Churio , A.J. Colussi
Yıl :
1996
Journal of Photochemistry and Photobiology A: Chemistry
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The photobleaching of OClO dissolved in CCl4 was investigated by kinetic electron spin resonance spectrometry as a function of [OClO], [O2], photon flux, irradiation wavelength (λ = 303, 365 and 436 nm) and temperature (233 K ≤ T ≤ 298 K). OClO decays non-exponentially, the apparent kinetic order increasing with conversion. The initial quantum yields of OClO disappearance Φ are larger than one under anoxic conditions, but decrease in the presence of O2, except at 365 nm. The rates are directly proportional to the absorbed photon flux and depend weakly on temperature. Remarkably, OClO is partially regenerated after irradiation, even in fully bleached solid samples. We show that a minimal mechanism comprising 21 pseudo-elementary steps can account for these observations, within experimental error, if the primary products of OClO photodecomposition change from (O + ClO) at 303 and 436 nm to (Cl + O2) at 365 nm. The photolysis of ClOClO2, one of the putative intermediate species, into (Cl + OClO) also contributes to the initial rates at 303 nm.
DOI : 10.1016/s1010-6030(96)04347-x
Anahtar Kelimeler : Chlorine dioxide, Electron spin resonance, Kinetics, Ozone, Photodissociation
ISSN: 1010-6030
Sayı: 2-3
Cilt: 101
Sayfa: 105-111
Sınıflandırma :
20
Optical and photophysical properties of Ag/CdS nanocomposites—An analysis of relaxation kinetics of the charge carriers
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Anil Kumar , Vidhi Chaudhary
Yıl :
2007
Journal of Photochemistry and Photobiology A: Chemistry
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Ag/CdS nanocomposites have been synthesized and characterized by TEM, XRD, electronic and fluorescence spectroscopy. The content of Ag modifies the nature of surface interaction between the two components as revealed by TEM, electronic and fluorescence measurements. Increasing contents of silver in the composite reduces the interparticle separation. The addition of silver blue shifts the absorption maxima and, influences the emission behavior and charge dynamics in a complex manner. At low molar ratio of Ag:CdS about five-fold enhancement in fluorescence is observed which is attributed to the excited state charge transfer interaction between the two components. On the contrary at high Ag the fluorescence intensity is reduced significantly to become smaller than that of pure CdS nanoparticles. The quenching of emission is understood to occur by the rapid electron transfer from the excited CdS to Ag particle. Relaxation kinetics of charge carriers of CdS also reveal the formation of transitory CT complex between excited CdS and Ag, in which the extent of electron transfer is controlled by the amount of Ag and thus supporting the steady-state findings. A mechanism of these processes is discussed.
DOI : 10.1016/j.jphotochem.2007.02.013
Anahtar Kelimeler : Nanocomposite, Ag/CdS, Fluorescence, Optical, Charge carriers dynamics
ISSN: 1010-6030
Sayı: 2-3
Cilt: 189
Sayfa: 272-279
Sınıflandırma :
21
The interaction between graphene quantum dots grafted with polyethyleneimine and Au@Ag nanoparticles: Application as a fluorescence “turn-on” nanoprobe
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Ojodomo J. Achadu , Imran Uddin , Tebello Nyokong
Yıl :
2016
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
Graphene quantum dots grafted with polyethyleneimine (GQDs-PEI) and [email protected] core-shell nanoparticles blend was demonstrated to be a novel biosensing nanoprobe for the rapid and highly sensitive detection of biothiols such as cysteine (Cys), homocysteine (Hcys) and glutathione (GSH). The fluorescence emission of GQDs-PEI was quenched efficiently upon interaction with [email protected] core-shell nanoparticles. The quenched fluorescence emission of the GQDs-PEI was restored in the presence of the biothiols. The fluorimetric sensing is based on the strong affinity between the mercapto (SH) groups of the biothiols and the [email protected] core-shell nanoparticles by which the interaction between GQDs-PEI and [email protected] core-shell nanoparticles was disrupted with a consequent modulation (‘turn-on’) of the quenched GQDs-PEI emission. Thus, a new, simple, rapid and highly sensitive fluorescence nanoprobe for detecting biothiols has been developed in this work.
DOI : 10.1016/j.jphotochem.2016.03.016
Anahtar Kelimeler : Graphene quantum dots, Polyethyleneimine, Gold and silver nanoparticles, Fluorescence u2018turn-onu2019
ISSN: 1010-6030
Cilt: 324
Sayfa: 96-105
Sınıflandırma :
Kimya %100
Nanokimya %100
22
Expression systems for soluble metal-dependent formate dehydrogenase
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Masaki Ihara , Yusuke Kawano , Yusuke Fujiwara , Tetsuya Kodo , Manami Mizuguchi , Yusuke Mochiduki , Kai Kodoh , Ayako Okabe , Izumi Matsuno
Yıl :
2015
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
Molybdenum or tungsten-dependent formate dehydrogenases (FDH) can reduce carbon dioxide (CO2) to formate under ordinary conditions, and therefore, are considered promising catalysts for CO2 fixation. However, to our knowledge, no study on the modification of metal-dependent FDHs has been published, likely because of a lack of convenient expression systems for the recombinant enzymes. We attempted to establish an methodology for the preparation and modification of soluble oxygen-tolerant metal-dependent FDHs, for the following three strategies: (1) Escherichia coli FDH is converted from a membrane bound protein into a soluble protein by deleting the C-terminal membrane-anchor of small subunit (FdoH) and the whole membrane subunit (FdoI) and expressed homologously in E. coli; (2) originally soluble FDHs from Desulfovibrio are expressed heterologously in E. coli; and (3) Desulfovibrio FDHs are genetically engineered by the homologous gene recombination method and expressed homologously in Desulfovibrio. We successfully established the expression systems for (1) and (3), and succeeded in purification of the soluble FDHs with a tag by using affinity columns.
DOI : 10.1016/j.jphotochem.2015.06.028
Anahtar Kelimeler : Formate dehydrogenase, Recombinant protein, Expression system
ISSN: 1010-6030
Cilt: 313
Sayfa: 154-162
Sınıflandırma :
23
Fundamentals and misconceptions in photocatalysis
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Jean-Marie Herrmann
Yıl :
2010
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet Alıntıla
Photocatalysis has presently become a major discipline owing to two factors: (i) the intuition of the pioneers of last 20th century and (ii) the mutual enrichment of scientists arising from different fields: photochemistry, electrochemistry, analytical chemistry, radiochemistry, material chemistry, surface science, electronics, and hopefully catalysis. However, heterogeneous photocatalysis belongs to catalysis, which means that all the bases of this discipline must be respected and consequently, it has become imperative to refocus the frame of photocatalysis to avoid misfits and misconceptions: (i) proportionality of the reaction rate to the mass of catalyst (below the plateau due to a full absorption of photons); (ii) implication of the Langmuir–Hinshelwood mechanism of kinetics with the initial rate being proportional to the coverages θ in reactants; (iii) obtention of conversions beyond the stoichiometric threshold defined as the number of potential active sites initially present at the surface. Photonics should be respected with the photocatalytic activity being (i) parallel to the absorbance of the photocatalyst and (ii) proportional to the radiant flux Φ, enabling one to determine the quantum yield defined as the ratio of the reaction rate r (in molecules converted per second) to the efficient photonic flux (in photons per second) received by the solid. True photocatalytic normalized tests should be established to prove the real catalytic activity of irradiated solids, independent of non-catalytic side-reactions. In particular, dye decolorization is a misleading test, which only provides a “visible” and apparent “disappearance” of the dye, purely photochemical but not photocatalytic. Thermodynamics have also to be respected. The decrease of photon energy to the visible may be thermodynamically detrimental for the generation of highly active species such as OH°. Concerning solid state chemistry, it is now eventually admitted that cationic doping is detrimental for photocatalysis. Anionic doping must be rapidly clarified or otherwise abandoned. In conclusion, all these recommendations have to be addressed and experiments have to be operated in suitable conditions before claiming that one deals with a true photocatalytic reaction, whose veracity can be proved by following a protocol suggested at the end.
DOI : 10.1016/j.jphotochem.2010.05.015
Anahtar Kelimeler : Photocatalysis, Fundamentals, Right protocol, Misconceptions
ISSN: 1010-6030
Sayı: 2-3
Cilt: 216
Sayfa: 85-93
Sınıflandırma :
24
Comment on “The phototransformation of 4-chloro-2-methylphenoxyacetic acid under KrCl and XeBr excilamps irradiation in water Tchaikovskaya et al., J. Photochem. Photobiol. A: Chem. 228 (2012) 8–14”
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Sierra Rayne
Yıl :
2013
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
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Kaydet Alıntıla
DOI : 10.1016/j.jphotochem.2013.03.008
Anahtar Kelimeler : UV irradiation, MCPA, Photolysis, Photoinduced biodegradation, Wavelength effect
ISSN: 1010-6030
Cilt: 260
Sayfa: 37-38
Sınıflandırma :
25
Rapid and selective aptamer-based fluorescence detection of salivary lysozyme using plasmonic metal-enhanced fluorescence of ZnSSe alloyed quantum dots-gold nanoparticle nanohybrid
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier BV
Yazar(lar) :
Magda A. Pereira-Barros , Niamh Nic Daeid , Oluwasesan Adegoke
Yıl :
2021
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
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Kaydet Alıntıla
We report on the construction of an aptamer (Apt)-based fluorescent biosensor platform for salivary lysozyme using plasmonic metal-enhanced fluorescence of ZnSSe alloyed quantum dots (QDs)-gold nanoparticle (AuNP) nanohybrid. Salivary lysozyme was used as a model analyte to develop the Apt fluorescence biosensor assay for real-life detection of human saliva. To construct the biosensor, thiolated anti-salivary lysozyme DNA Apt was immobilised on the L-cysteine-ZnSSe QDs surface to form a functionalised Apt-ZnSSe-QDs. Thereafter, citrate-AuNPs was bonded to the Apt-ZnSSe-QDs to form an Apt-ZnSSe-QDs-AuNP fluorescence biosensor probe. Using affinity-based biomolecular binding interaction between the Apt and target lysozyme, the binding effect induced localised surface plasmon resonance (LSPR) signal from AuNPs to amplify the fluorescence signal of the QDs upon lysozyme recognition. Probing the LSPR signal amplifying effects of different plasmonic NPs, our analysis showed that spherical citrate-AuNPs of size 6 nm was most effective in amplifying the fluorescence signal of the biosensor probe. Under optimum experimental reaction conditions, salivary lysozyme was detected quantitatively within 5 min with a detection limit of 22.9 μg/mL and was highly selective against other tested enzymes. Application of the Apt-ZnSSe QDs-AuNP biosensor probe to detect real human saliva samples was successfully achieved.
DOI : 10.1016/j.jphotochem.2021.113384
Anahtar Kelimeler : Fluorescence, AuNPs, QDs, Lysozyme, Detection
ISSN: 1010-6030
Cilt: 418
Sayfa: 113384
26
Fast and slow processes of thermal deactivation of excited stilbazolium merocyanine dyes
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
A. Planner , D. Frąckowiak
Yıl :
2001
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The long living triplet states play important role in sensitizing action in all photochemical reactions. The yield of generation of triplet states of dyes can be evaluated on the basis of measurements of their slow (microsecond) thermal deactivation (TD). All experiments were carried out in the oxygen presence, it means under quenching dye triplets. The pulse dye laser generates in the investigated solution pressure signal. The high of the amplitudes of first maximum of this pressure wave-form signal in the solution of the investigated dye and in the reference sample were measured. Reference sample exhibits only fast processes of TD. The comparison of the first maximum of wave-form photothermal signal of sample and of reference enable to calculate part of energy exchanged into heat in time longer than time resolution of arrangement. The fluorescence yields of investigated dyes were also established. On the basis of such data, using procedure described in literature, the yield of singlet–triplet intersystem crossing (ISC) was evaluated. It was shown that this yield depends on the length of stilbazolium merocyanine chain. The product of triplet state yield and energy was lower for merocyanines with longer chains. At lower temperatures the yield of fluorescence increases and amount of excitation exchanged in short time into heat decreases. The slow TD process increases in low temperature because of the decrease in the quenching of the dyes triplet states by oxygen. The amount of energy exchanged into heat in a time longer than time resolution of apparatus is due predominantly through TD of the dye triplet states.
DOI : 10.1016/s1010-6030(01)00404-x
Anahtar Kelimeler : Laser induced optoacoustic spectroscopy, Stilbazolium merocyanines, Yield of triplet states
ISSN: 1010-6030
Sayı: 3
Cilt: 140
Sayfa: 223-228
Sınıflandırma :
27
IFC Editorial Board
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yıl :
2008
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
DOI : 10.1016/s1010-6030(08)00260-8
ISSN: 1010-6030
Sayı: 2-3
Cilt: 198
Sayfa: CO2
Sınıflandırma :
28
Photochemistry on surfaces. Photochemical behavior of 1,3-diphenylisobenzofuran over alumina
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
K. Vinodgopal , Prashant V. Kamat
Yıl :
1992
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
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Kaydet Alıntıla
The photodegradation of 1,3-diphenylisobenzofuran (DPBF) over an alumina surface at various coverages was investigated by diffuse reflectance measurements. DPBF over an alumina surface exhibits strong absorption (λmax=425 nm) and emission (λmax=480 nm) in the visible region. At submonolayer coverages, the air-equilibrated DPBF/Al2O3 samples undergo rapid photodegradation as DPBF reacts with singlet oxygen. The dependence of the half-life of the decay on the surface coverage highlights the role of the support material in the promotion of the photodegradation of furan.
DOI : 10.1016/1010-6030(92)85160-v
ISSN: 1010-6030
Sayı: 1
Cilt: 63
Sayfa: 119-125
Sınıflandırma :
Kimya %99
Kataliz %84
29
Investigation of the photo-dissociation reactions for alkyl nitrite by quantum chemical molecular dynamics program “Colors-Excite”
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Xiaojing Wang , Yajun Wang , Chen Lv , Momoji Kubo , Akira Miyamoto
Yıl :
2007
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
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Kaydet Alıntıla
The photodissociation of alkyl nitrites series (RONO) in gaseous state were studied using density functional theory with Amsterdam Density Functional program (ADF2000) and quantum chemical molecular dynamical method by “Colors-Excite” code. The different dissociative phenomena have been explained by this investigation. Alkyl nitrites were shifted to their excited states by capturing the light energy and the bonds of O–N (RO–NO) were broken. A two-step reaction occurred for methyl nitrite (THN) to yield the diverse products, such as RO radical, NO and HNO, whereas only one-step reaction occurred for tert-butyl nitrite (TBN). The consistent results in theoretical calculation and experiment, including geometrical structures and excitation energies, demonstrated the good performances of “Colors-Excite”.
DOI : 10.1016/j.jphotochem.2006.10.004
Anahtar Kelimeler : Photodissociation, Alkyl nitrites, Quantum chemical molecular dynamics, Density functional theory, Colors-Excite
ISSN: 1010-6030
Sayı: 1
Cilt: 187
Sayfa: 119-126
Sınıflandırma :
30
Oxidation of crystal violet and malachite green in aqueous solutions — a kinetic spectrophotometric study
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
A.C. Bhasikuttan , A.V. Sapre , L.V. Shastri
Yıl :
1995
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
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Kaydet Alıntıla
The reactions of two triphenyl methane (TPM) dyes—crystal violet (CV+) and malachite green (MG+)—with N3• and OH• radicals were studied by pulse radiolytic kinetic spectrophotometry. The rate constants for the reaction of the cationic dyes (D+) with N3• are (9.0±0.6)×109 and (3.0±0.2)×109 dm3 mol−1 s−1 respectively and those for the reaction with OH• are obtained as (8.0±0.6)×109 and (1.1±0.1)×109 dm3 mol−1 s−1 respectively. The transient spectra resulting from the oxidation of the dyes were characterized. The time-resolved spectra indicate that the reaction with OH• radicals initially generates an adduct which subsequently dissociates to form the radical dication D•2+. The D•2+ species decay by further reaction with the parent dye.
DOI : 10.1016/1010-6030(95)04094-v
Anahtar Kelimeler : Oxidation, Crystal violet, Malachite green, Kinetic spectrophotometry, Radicals, Pulse radiolysis
ISSN: 1010-6030
Sayı: 2-3
Cilt: 90
Sayfa: 177-182
Sınıflandırma :

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