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1
A Spherically Shielded Triphenylamine and Its Persistent Radical Cation
Dergi Makalesi

Dergi Makalesi
Kaynak :
JSTOR
Dergi:
Chemistry - A European Journal
Yayıncı:
John Wiley & Sons, Inc.
Yazar(lar) :
Dr. Frank Hampel , Dr. Theresa Mekelburg , Prof.u2005Dr. Karsten Meyer , Prof.u2005Dr. Milan Kivala , Prof.u2005Dr. Pavlo O. Dral , Matthias Miehlich , Dr. Tobias A. Schaub
Chemistry - A European Journal
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet
DOI : 10.1002/chem.202000355
2
Lyotropic liquid crystal to soft mesocrystal transformation in hydrated salt-surfactant mixtures
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yazar(lar) :
C. Albayrak , G. Barım , Ö. Dag
Konu :
Alkali metals, Liquid crystals, Mesophases, Salts, Surfactants
Yıl :
2013
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
Hydrated CaCl2, LiI, and MgCl2 salts induce self-assembly in nonionic surfactants (such as C12H 25(OCH2CH2)10OH) to form lyotropic liquid-crystalline (LLC) mesophases that undergo a phase transition to a new type of soft mesocrystal (SMC) under ambient conditions. The SMC samples can be obtained by aging the LLC samples, which were prepared as thin films by spin-coating, dip-coating, or drop-casting of a clear homogenized solution of water, salt, and surfactant over a substrate surface. The LLC mesophase exists up to a salt/surfactant mole ratio of 8, 10, and 4 (corresponding to 59, 68, and 40wt % salt/surfactant) in the CaCl2, LiI, and MgCl2 mesophases, respectively. The SMC phase can transform back to a LLC mesophase at a higher relative humidity. The phase transformations have been monitored using powder X-ray diffraction (PXRD), polarized optical microscopy (POM), and FTIR techniques. The LLC mesophases only diffract at small angles, but the SMCs diffract at both small and wide angles. The broad surfactant features in the FTIR spectra of the LLC mesophases become sharp and well resolved upon SMC formation. The unit cell of the mesophases expands upon SMC transformation, in which the expansion is largest in the MgCl2 and smallest in the CaCl2 systems. The POM images of the SMCs display birefringent textures with well-defined edges, similar to crystals. However, the surface of the crystals is highly patterned, like buckling patterns, which indicates that these crystals are quite soft. This unusual phase behavior could be beneficial in designing new soft materials in the fields of phase-changing materials and mesostructured materials, and it demonstrates the richness of the phase behavior in the salt-surfactant mesophases.
DOI : 10.1002/chem.201301662
Anahtar Kelimeler : Alkali metals, Liquid crystals, Mesophases, Salts, Surfactants, Article
Cilt: 19
Sayı: 44
ISSN: 0947-6539
Sayfa: 15026-15035
Sınıflandırma :
3
Sequence-specific self-sorting of the binding sites of a ditopic guest by cucurbituril homologues and subsequent formation of a hetero4pseudorotaxane
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Bilkent Üniversitesi
Yazar(lar) :
G. Celtek , M. Artar , O. A. Scherman , D. Tuncel
Konu :
Chemical nature, Ditopic guests, Recognition behavior, Self-recognition, Selfsorting, Binding energy, Macromolecules, Supramolecular chemistry, Binding sites, Cucurbituril, Chemical structure, Chemistry, Synthesis, Binding sites, Macrocyclic compounds, Mass spectrometry, Molecular structure, Rotaxanes
Yıl :
2009
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
Ties us together: The selectivity and recognition behavior of cucurbit[n]uril (CB[n]) homologues (n = 6,7,8) towards a ditopic guest containing two distinct binding sites is explored. CB6, CB7, and CB8 recognize and self-sort the binding sites according to their size, shape, and chemical nature. In the presence of both CB6 and CB8 a hetero[4]pseudorotaxane is formed. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.
DOI : 10.1002/chem.200901504
Anahtar Kelimeler : Chemical nature, Ditopic guests, Recognition behavior, Self-recognition, Selfsorting, Binding energy, Macromolecules, Supramolecular chemistry, Binding sites, Cucurbituril, Chemical structure, Chemistry, Synthesis, Binding sites, Macrocyclic compounds, Mass spectrometry, Molecular structure, Rotaxanes, Article
Cilt: 15
Sayı: 40
ISSN: 0947-6539
Sayfa: 10360-10363
4
pH-triggered dethreading-rethreading and switching of cucurbit6uril on bistable 3pseudorotaxanes and 3rotaxanes
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry a European Journal
Yayıncı:
Bilkent Üniversitesi
Yazar(lar) :
D. Tuncel , M. Katterle
Konu :
Cucurbituril, Molecular switches, Nanotechnology, Rotaxanes, Supramolecular chemistry
Yıl :
2008
Chemistry a European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
A series of water-soluble [3]rotaxanes-(n+2) and [3]pseudorotaxanes-(n+2) with short (propyl, n=1) and long (dodecyl, n=10) aliphatic spacers have been prepared in high yields by a 1,3-dipolar cycloaddition reaction catalyzed by cucurbit[6]uril (CB6). The pH-triggered dethreading and rethreading of CB6 on these pseudorotaxanes was monitored by 1H NMR spectroscopy. A previously reported [3]rotaxane-12 that is known to behave as a bistable molecular switch has two recognition sites for CB6, that is, the diaminotriazole moieties and the dodecyl spacer. By changing the pH of the system, it is possible to observe more than one state in the shuttling process. At low pH values both CB6 units are located on the diaminotriazole moieties owing to an ion-dipole interaction, whereas at high pH values both of the CB6 units are located on the hydrophobic dodecyl spacer. Surprisingly, the CB6 units shuttle back to their initial state very slowly after reprotonation of the axle. Even after eighteen days at room temperature, only about 50 % of the CB6 units had relocated back onto the diaminotriazole moieties. The rate constants for the shuttling processes were measured as a function of temperature over the range from 313 to 333 K and the activation parameters (enthalpy, entropy, and free energy) were calculated by using the Eyring equation. The results indicate that this [3]rotaxane behaves as a kinetically controlled molecular switch. The switching properties of [3]rotaxane-3 have also been studied. However, even under extreme pH conditions this rotaxane has not shown any switching action, which confirms that the propyl spacer is too short to accommodate CB6 units.
DOI : 10.1002/chem.200702003
Anahtar Kelimeler : Cucurbituril, Molecular switches, Nanotechnology, Rotaxanes, Supramolecular chemistry, Article
Cilt: 14
Sayı: 13
ISSN: 0947-6539
Sayfa: 4110-4116
Sınıflandırma :
5
Site-selective synthesis of b-70PCBM-like fullerenes: efficient application in perovskite solar cells
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Wiley-VCH Verlag
Yazar(lar) :
S. Vidal , M. Izquierdo , S. Filippone , I. Fernández , Seçkin Akın , J.-Y. Seo , S.M. Zakeeruddin
Konu :
Cyclopropanation Reaction, Fullerenes, Interface Passivation, Perovskite Solar Cells, Site-Selectivity
Yıl :
2019
Chemistry - A European Journal
Yayıncı Web Sitesi
Kaydet
We report on the site-selective synthesis of PCBM-like [70]fullerene site-isomers, where the elusive ?-site-isomers are, for the first time, the major product in a (cyclo)addition chemical reaction involving [70]fullerene. The reaction involves an straightforward cyclopropanation of [70]fullerene from sulfonium salts, affording a mixture of ? and ? site-isomers in good yields. Amazingly, the preference for the ?- or ?-site-isomer can be efficiently controlled by means of the solvent polarity! DFT theoretical calculations (DMF and toluene) nicely predict that, although the formation of the ?-adduct is, as expected, thermodynamically favored, the selectivity of the process is determined by the energy difference of the respective transition states. Furthermore, the employ of ? or/and ? site-isomers, as pure materials or as a mixture of them, used as templating agent, has been evaluated in perovskite solar cells. The positive influence of the [70]fullerenes by passivating the voids/pin-holes and/or deep slits, is reflected in highly efficient and stable bulk heterojunction perovskite solar cells, whose performance (around 20 %) is slightly but consistently depending on the isomeric fullerene composition. These experimental findings pave the way to investigate a new reactivity on C 70 and to explore the properties of the less-known ?-derivatives.
Anahtar Kelimeler : Cyclopropanation Reaction, Fullerenes, Interface Passivation, Perovskite Solar Cells, Site-Selectivity, article
Cilt: 25
Sayı: 13
ISSN: 0947-6539
Sınıflandırma :
Kimya %93
Kataliz %31
6
Geminally diaurated aryls bridged by semirigid phosphine pillars: Syntheses and electronic structure
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Wiley-VCH Verlag
Yazar(lar) :
Tokat Gazi Osman Paşa Üniversitesi
Konu :
Aromaticity, Aurophilicity, Density functional calculations, Gold, Phosphine ligands
Yıl :
2014
Chemistry - A European Journal
Yayıncı Web Sitesi
Kaydet
Geminally diaurated ?2-aryl complexes have been prepared where gold(I) centers were bridged by the semirigid diphosphine ligands bis(2-diphenylphosphinophenyl)-ether (DPEphos) and 4,6-bis(diphenylphosphanyl)dibenzo-[b,d]furan (DBFphos). Diaurated complexes were synthesized in ligand redistribution reactions of the corresponding di-gold dichlorides with di-gold diaryls (six of them new) and silver(I) salts. Diaurated complexes were isolated as salts of the minimally coordinating anions SbF6- and ReO4-. Efforts to prepare salts of the tetraarylborate [B(3,5-(CF3)2C6H3)4]-led to transmetalation from boron, with crystallization of the fluorinated aryl complex. The new complexes were characterized by multinuclear NMR, absorption and emission spectroscopies, 77 K emission lifetimes, and by combustion analysis; three are crystallographically characterized. Structures of geminally diaurated aryl ligands are compared to those of mono-aurated analogues. Both crystal structures and density-functional theory calculations indicate slight but observable disruptions of aryl ligand aromaticity by geminal di-gold binding. An intermolecular aurophilic interaction in one structurally authenticated complex was examined computationally. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Anahtar Kelimeler : Aromaticity, Aurophilicity, Density functional calculations, Gold, Phosphine ligands, article
Cilt: 20
Sayı: 52
ISSN: 0947-6539
7
Novel molecular building blocks based on the boradiazaindacene chromophore: applications in fluorescent metallosupramolecular coordination polymers
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Bilkent Üniversitesi
Yazar(lar) :
Ö. A. Bozdemir , O. Büyükcakir , E. U. Akkaya
Konu :
Polymerization, Self-assembly, Sonogashira coupling, Bipyridyl, Building blocks, Complex structures, Coordination polymers, Dyespigments, Dynamic equilibrium, Fluorescence emissions, Functionalized, Metal ion concentrations, Metallo-supramolecular, Molecular building blocks, Supramolecular polymerizations, Chromophores, Emission spectroscopy, Fluorescence, Ligands, Metal complexes, Metal ions, Metals, Monomers, Polymers, Rhenium compounds, Stoichiometry, Trace analysis, Zinc, Functional polymers
Yıl :
2009
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
We designed and synthesized novel boradiazaindacene (Bodipy) derivatives that are appropriately functionalized for metal-ion-mediated supramolecular polymerization. Thus, ligands for 2-terpyridyl-, 2,6-terpyridyl-, and bipyridyl-functionalized Bodipy dyes were synthesized through Sonogashira couplings. These fluorescent building blocks are responsive to metal ions in a stoichiometry-dependent manner. Octahedral coordinating metal ions such as Zn II result in polymerization at a stoichiometry corresponding to two terpyridyl ligands to one Zn II ion. However, at increased metal ion concentrations, the dynamic equilibria are re-established in such a way that the monomeric metal complex dominates. The position of equilibria can easily be monitored by 1H NMR and fluorescence spectroscopies. As expected, although open-shell Fe II ions form similar complex structures, these cations quench the fluorescence emission of all four functionalized Bodipy ligands. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.
DOI : 10.1002/chem.200802538
Anahtar Kelimeler : Polymerization, Self-assembly, Sonogashira coupling, Bipyridyl, Building blocks, Complex structures, Coordination polymers, Dyespigments, Dynamic equilibrium, Fluorescence emissions, Functionalized, Metal ion concentrations, Metallo-supramolecular, Molecular building blocks, Supramolecular polymerizations, Chromophores, Emission spectroscopy, Fluorescence, Ligands, Metal complexes, Metal ions, Metals, Monomers, Polymers, Rhenium compounds, Stoichiometry, Trace analysis, Zinc, Functional polymers, Article
Cilt: 15
Sayı: 15
ISSN: 0947-6539
Sayfa: 3830-3838
Sınıflandırma :
8
Water oxidation electrocatalysis with a cobalt ‐ borate ‐ based hybrid system under neutral conditions
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Dergi Makalesi
Open Access
Kaynak 1:
DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Dergi:
Chemistry: A European Journal
Yayıncı:
Wiley-VCH Verlag
Yazar(lar) :
Emine A. Turhan , Satya Vijaya Kumar Nune , E. Ülker , U. Şahin , Y. Dede , Ferdi Karadaş
Konu :
Borate, Cobalt, Density functional calculations, Electrocatalysis, Water oxidation
Yıl :
2018
Chemistry: A European Journal
Tam Metin
Kaydet
The development of new water oxidation electrocatalysts that are both stable and efficient, particularly in neutral conditions, holds great promise for overall water splitting. In this study, the electrocatalytic water oxidation performance of a new cobalt-based catalyst, Co3(BO3)2, with a Kotoite-type crystal structure is investigated under neutral conditions. The catalyst is also hybridized with CNTs to enhance its electrocatalytic properties. A remarkable increase in catalytic current along with a significant shift in the onset overpotential is observed in Co3(BO3)2@CNT. Additionally, CNT addition also greatly influences the surface concentration of the catalyst: 12.7 nmol cm−2 for Co3(BO3)2@CNT compared with 3.9 nmol cm−2 for Co3(BO3)2. Co3(BO3)2@CNT demands overpotentials of 303 and 487 mV to attain current densities of 1 and 10 mA cm−2, respectively, at pH 7. Electrochemical and characterization studies performed over varying pH conditions reveal that the catalyst retains its stability over a pH range of 3-14. Multi-reference quantum chemical calculations are performed to study the nature of the active cobalt sites and the effect of boron atoms on the activity of the cobalt ions.
DOI : 10.1002/chem.201801412
Anahtar Kelimeler : Borate, Cobalt, Density functional calculations, Electrocatalysis, Water oxidation, Article
Cilt: 24
Sayı: 41
ISSN: 0947-6539
Sayfa: 10372-10382
Sınıflandırma :
Kimya %94
Kataliz %75
Elektrokimya %22
9
Acceptorless Dehydrogenative Oxidation of Secondary Alcohols Catalysed by Cp*Ir-III-NHC Complexes
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Dergi Makalesi
Kaynak 1:
DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Dergi:
Chemistry-A European Journal
Yayıncı:
Wiley-V C H Verlag Gmbh
Yazar(lar) :
Gulcemal Suleyman , Gulcemal Derya , Whitehead George F. S. , Xiao Jianliang
Konu :
acceptorless dehydrogenation, alcohols, carbenes, iridium, oxidation
Yıl :
2016
Chemistry-A European Journal
Kaydet
A series of new Ir-III complexes with carbene ligands that contain a range of benzyl wingtip groups have been prepared and fully characterised by NMR spectroscopy, HRMS, elemental analysis and X-ray diffraction. All the complexes were active in the acceptorless dehydrogenation of alcohol substrates in 2,2,2-trifluoroethanol to give the corresponding carbonyl compounds. The most active complex bore an electron-rich carbene ligand; this complex was used to catalyse the highly efficient and chemoselective dehydrogenation of a wide range of secondary alcohols to their respective ketones, with turnover numbers up to 1660. Mechanistic studies suggested that the turnover of the dehydrogenation reaction is limited by the H-2-formation step.
Anahtar Kelimeler : acceptorless dehydrogenation, alcohols, carbenes, iridium, oxidation, article
Cilt: 22
Sayı: 30
ISSN: 0947-6539
Sınıflandırma :
10
Synthesis of symmetrical multichromophoric bodipy dyes and their facile transformation into energy transfer cassettes
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Bilkent Üniversitesi
Yazar(lar) :
Bilkent Üniversitesi
Konu :
Dyespigments, Sonogashixa coupling, Chemical transformations, Dipyrromethene, Diverse applications, Donor, acceptor, Dyespigments energy transfer, Efficient energy transfer, Emission lifetime, Energy-transfer systems, Excitation spectrum, Fluorescence spectroscopy techniques, Potential applications, Stokes shift, Boron, Boron compounds, Chromophores, Fluorescence spectroscopy, Fluorophores, Synthesis (chemical), Energy transfer
Yıl :
2010
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
Multichromophoric boron-dipyrromethene (Bodipy) dyes synthesized on phenylene-ethynylene platforms have been be converted to energy transfer cassettes in a one-step chemical transformation. Excitation energy transfer processes in these highly symmetrical derivatives were studied in detail, including time-re-solved fluorescence spectroscopy techniques. Excitation spectra and the emission lifetimes suggest efficient energy transfer between the donor and acceptor chromophore. These novel energy transfer cassettes, while highlighting a short-cut approach to similar energy transfer systems, could be useful as large pseudo-Stokes shift multichromophoric dyes with potential applications in diverse applications.
DOI : 10.1002/chem.200903449
Anahtar Kelimeler : Dyespigments, Sonogashixa coupling, Chemical transformations, Dipyrromethene, Diverse applications, Donor and acceptor, Dyespigments energy transfer, Efficient energy transfer, Emission lifetime, Energy-transfer systems, Excitation spectrum, Fluorescence spectroscopy techniques, Potential applications, Stokes shift, Boron, Boron compounds, Chromophores, Fluorescence spectroscopy, Fluorophores, Synthesis (chemical), Energy transfer, Article
Cilt: 16
Sayı: 21
ISSN: 0947-6539
Sayfa: 6346-6351
Sınıflandırma :
11
Synthesis of mesoporous lithium titanate thin films and monoliths as an anode material for high-rate lithium-ion batteries
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry: A European Journal
Yayıncı:
Wiley-VCH Verlag
Yazar(lar) :
F. M. Balcı , Ö. U. Kudu , E. Yılmaz , Ö. Dag
Konu :
Anodes, Assembly, Calcination, Characterization, Electric batteries, Electrochemistry, Electrodes, Films, Lithium, Lithium alloys, Lithium compounds, Mesoporous materials, Self assembly, Thin film lithium ion batteries, Thin films, Annealing temperatures, Anode material for lithium ion batteries, Discharge capacities, Electrochemical characterizations, Initial discharge capacities, Mesoporous thin films, Raman techniques, Self assembly process, Lithium-ion batteries
Yıl :
2016
Chemistry: A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
Mesoporous Li4Ti5O12 (LTO) thin film is an important anode material for lithium-ion batteries (LIBs). Mesoporous films could be prepared by self-assembly processes. A molten-salt-assisted self-assembly (MASA) process is used to prepare mesoporous thin films of LTOs. Clear solutions of CTAB, P123, LiNO3, HNO3, and Ti(OC4H9)4 in ethanol form gel-like meso-ordered films upon either spin or spray coating. In the assembly process, the CTAB/P123 molar ratio of 14 is required to accommodate enough salt species in the mesophase, in which the LiI/P123 ratio can be varied between molar ratios of 28 and 72. Calcination of the meso-ordered films produces transparent mesoporous spinel LTO films that are abbreviated as Cxx-yyy-zzz or CAxx-yyy-zzz (C=calcined, CA=calcined–annealed, xx=LiI/P123 molar ratio, and yyy=calcination and zzz=annealing temperatures in Celsius) herein. All samples were characterized by using XRD, TEM, N2-sorption, and Raman techniques and it was found that, at all compositions, the LTO spinel phase formed with or without an anatase phase as an impurity. Electrochemical characterization of the films shows excellent performance at different current rates. The CA40-350-450 sample performs best among all samples tested, yielding an average discharge capacity of (176±1) mA h g−1 at C/2 and (139±4) mA h g−1 at 50 C and keeping 92 % of its initial discharge capacity upon 50 cycles at C/2.
DOI : 10.1002/chem.201604253
Anahtar Kelimeler : Anodes, Assembly, Calcination, Characterization, Electric batteries, Electrochemistry, Electrodes, Films, Lithium, Lithium alloys, Lithium compounds, Mesoporous materials, Self assembly, Thin film lithium ion batteries, Thin films, Annealing temperatures, Anode material for lithium ion batteries, Discharge capacities, Electrochemical characterizations, Initial discharge capacities, Mesoporous thin films, Raman techniques, Self assembly process, Lithium-ion batteries, Article
Cilt: 22
Sayı: 52
ISSN: 0947-6539
Sayfa: 18873-18880
Sınıflandırma :
12
Near-IR absorbing BODIPY derivatives as glutathione-activated photosensitizers for selective photodynamic action
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry: A European Journal
Yayıncı:
Wiley-VCH Verlag
Yazar(lar) :
I. S. Turan , F. P. Cakmak , D. C. Yildirim , R. Cetin Atalay , E. U. Akkaya
Konu :
BODIPY dyes, Photochemistry, Photodynamic action, Photosensitizers, Singlet oxygen, Cell culture, Dissolved oxygen, Molecular oxygen, Peptides, Photochemical reactions, Photodynamic therapy, Bodipy dyes, Cancer cells, Cytotoxic, Glutathione concentration, Glutathiones, Near-IR, Photodynamic action, Singlet oxygen, Photosensitizers
Yıl :
2014
Chemistry: A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
Enhanced spatiotemporal selectivity in photonic
sensitization of dissolved molecular oxygen is an important target for improving the potential and the practical
applications of photodynamic therapy. Considering the
high intracellular glutathione concentrations within cancer
cells, a series of BODIPY-based sensitizers that can generate cytotoxic singlet oxygen only after glutathione-mediated cleavage of the electron-sink module were designed
and synthesized. Cell culture studies not only validate our
design, but also suggest an additional role for the relatively hydrophobic quencher module in the internalization of
the photosensitizer.
DOI : 10.1002/chem.201405450
Anahtar Kelimeler : BODIPY dyes, Photochemistry, Photodynamic action, Photosensitizers, Singlet oxygen, Cell culture, Dissolved oxygen, Molecular oxygen, Peptides, Photochemical reactions, Photodynamic therapy, Bodipy dyes, Cancer cells, Cytotoxic, Glutathione concentration, Glutathiones, Near-IR, Photodynamic action, Singlet oxygen, Photosensitizers, Article
Cilt: 20
Sayı: 49
ISSN: 0947-6539
Sayfa: 16088-16092
Sınıflandırma :
13
A new, highly conductive, lithium salt
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Wiley-VCH Verlag
Yazar(lar) :
C. Albayrak , A. Cihaner , Ö. Dag
Konu :
Electrochromic Devices, Electrolyte Materials, Ionic Conductivity, Liquid Crystals, Lithium
Yıl :
2012
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
Salty water! Lithium salts (LiCl, LiNO3, and LiClO4) at very high concentrations in water form lyotropic liquid crystalline (LLC) mesophases with a nonionic surfactant (10-lauryl ether) and display high ionic conductivities (10−2–10−4 S cm−1) over a broad temperature range (−10 to 80 °C) with excellent behavior as gel electrolytes in electrochemical applications.
DOI : 10.1002/chem.201103705
Anahtar Kelimeler : Electrochromic Devices, Electrolyte Materials, Ionic Conductivity, Liquid Crystals, Lithium, Article
Cilt: 18
Sayı: 14
ISSN: 0947-6539
Sayfa: 4190-4194
Sınıflandırma :
14
Tuning the Electronic Properties of Prussian Blue Analogues for Efficient Water Oxidation Electrocatalysis: Experimental and Computational Studies
Dergi Makalesi

Dergi Makalesi
Kaynak 1:
DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Dergi:
Chemistry-A European Journal
Yayıncı:
Wiley-V C H Verlag Gmbh
Yazar(lar) :
Elif Pinar Alsac , Emine Ulker , Satya Vijaya Kumar Nune , Yavuz Dede , Ferdi Karadas
Konu :
cyanides, density functional calculations, electrocatalysis, Prussian Blue, water oxidation
Yıl :
2018
Chemistry-A European Journal
Kaydet
Although several Prussian Blue analogues (PBAs) have been investigated as water oxidation catalysts, the field lacks a comprehensive study that focuses on the design of the ideal PBA for this purpose. Here, members of a series of PBAs with different cyanide precursors have been investigated to study the effect of hexacyanometal groups on their electrocatalytic water oxidation activities. Cyclic voltammetric, chronoamperometric, and chronopotentiometric measurements have revealed a close relationship between the electron density of electroactive cobalt sites and electrocatalytic activity, which has also been confirmed by infrared and XPS studies. Furthermore, pH-dependent cyclic voltammetry and computational studies have been performed to gain insight into the catalytic mechanism and electronic structure of cyanide-based systems to identify possible intermediates and to assign the rate-determining step of the target process.
Anahtar Kelimeler : cyanides, density functional calculations, electrocatalysis, Prussian Blue, water oxidation, article
Cilt: 24
Sayı: 19
ISSN: 0947-6539
Sınıflandırma :
Kimya %93
Kataliz %63
Elektrokimya %33
15
Twelve-membered O-bridged cyclic ethers of red seaweeds in the genus Laurencia exist in solution as slowly interconverting conformers
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
CHEMISTRY-A EUROPEAN JOURNAL
Yayıncı:
CHEMISTRY-A EUROPEAN JOURNAL
Yazar(lar) :
G Guella , F Pietra , A Oztunc , I Mancini , G Chiasera
Konu :
Temel Bilimler (SCI), Alkoloidler, KİMYA, MULTİDİSİPLİNER, Kimya, Biyokimya, Temel Bilimler
Yıl :
1997
CHEMISTRY-A EUROPEAN JOURNAL
Yayıncı Web Sitesi
Kaydet
The twelve-membered O-bridged cyclic ether obtusallene IV (1), a new isolate from the red seaweed Laurencia obtusa from Kas in the Turkish Mediterranean, revealed temperature-dependent NMR signals attributable to a major conformer in equilibrium with a minor conformer by 180 degrees flipping of the trans olefinic bond. This prompted us to reexamine the known congeners obtusallene I (2), 10-bromoobtusallene I (3), obtusallene II (4), and obtusallene III (5), isolated both from the same and taxonomically related seaweeds, as well as their semisynthetic derivative peracetylobtusallene III (6). Two conformers could in fact be directly observed at room temperature for 2-3 and at low temperature for 4. Marked cross-saturation-transfer effects between the couples of conformers confirmed these observations. Activation energies for processes involving 10-membered subunit rings (2-3) are higher than for 11-membered (4-5) analogues, where faster conformational motion occurs too resulting in mediated vicinal J couplings. 1,3-Dihydroxy substituents in 5 form an intramolecular hydrogen bond in low-polarity, non-H-bonding solvents; this results in the existence of two further conformers, giving more complex NMR spectra. Descriptions in the literature of single conformers for obtusallenes 2-5 must have resulted from overlooking minor NMR signals or attributing them to impurities.
Anahtar Kelimeler : Temel Bilimler (SCI), Alkoloidler, KİMYA, MULTİDİSİPLİNER, Kimya, Biyokimya, Temel Bilimler, Makale

ISSN: 0947-6539
Sınıflandırma :
16
eta(6)-mesityl,eta(1)-imidazolinylidene-carbene-ruthenium(II) complexes: Catalytic activity of their allenylidene derivatives in alkene metathesis and cycloisomerisation reactions
Dergi Makalesi

Dergi Makalesi
Kaynak 1:
DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Dergi:
Chemistry-A European Journal
Yayıncı:
Wiley-V C H Verlag Gmbh
Yazar(lar) :
Cetinkaya B , Demir S , Ozdemir I , Toupet L , Semeril D , Bruneau C , Dixneuf PH
Konu :
alkene metathesis, arenes, carbenes, catalysis, cycloisomerisation, ruthenium
Yıl :
2003
Chemistry-A European Journal
Kaydet
The reaction of electron-rich carbene-precursor olefins containing two imidazolinylidene moieties [(2,4,6-Me3C6H2CH2)NCH2CH2N(R)C=](2) (2a: R = CH2CH2OMe, 2b R = CH(2)Mes), bearing at least one 2,4,6-trimethylbenzyl (R = CH(2)Mes) group on the nitrogen atom, with [RuCl2(arene)](2) (arene = p-cymene, hexamethylbenzene) selectively leads to two types of complexes. The cleavage of the chloride bridges occurs first to yield the expected (carbene) (arene)ruthenium(H) complex 3. Then a further arene displacement reaction takes place to give the chelated eta(6)-mesityl,eta'-carbene-ruthenium complexes 4 and 5. An analogous eta(6)-arene-eta(1)-carbene complex with a benzimidazole frame 6 was isolated from an in situ reaction between [RuCl2(p-cymene)](2), the corresponding benzimidazolium salt and cesium carbonate. On heating, the RuCl2(imidazolinylidene) (p-cymene) complex 8, with p-methoxybenzyl pendent groups attached to the N atoms, leads to intramolecular p-cymene displacement and to the chelated eta(6)-arene,eta(1)-carbene complex 9. On reaction with AgOTf and the propargylic alcohol HC=CCPh20H, compounds 4-6 were transformed into the corresponding ruthenium allenylidene intermediates (4-->10, 5-->11, 6-->12). The in situ generated intermediates 10-12 were found to be active and selective catalysts for ring-closing metathesis (RCM) or cycloisomerisation reactions depending on the nature of the 1,6-dienes. Two complexes [RuCl2-{eta(1)-CN(CH2C6H2Me3-2,4,6)CH2CH2N- (CH2CH2OMe)}(C6Me6)] 3 with a monodentate carbene ligand and [RuCl2-{eta(1)-CN[CH2(eta(6)-C6H2Me3-2,4,6)]CH2CH2N-(CH2C6H2Me3-2,4,6)}] 5 with a chelating carbene-arene ligand were characterised by X-ray crystallography.
Anahtar Kelimeler : alkene metathesis, arenes, carbenes, catalysis, cycloisomerisation, ruthenium, article
Cilt: 9
Sayı: 10
ISSN: 0947-6539
Sınıflandırma :
17
Fabrication of mesoporous metal chalcogenide nanoflake silica thin films and spongy mesoporous CdS and CdSe
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Wiley Online Library
Yazar(lar) :
Y. Türker , C. Karakaya , Ö. Dag
Konu :
Mesoporous Materials, Metal Selenides, Metal Sulfides, Nanomaterials, Thin Films
Yıl :
2012
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
Mesoporous silica metal
oxide (ZnO and CdO) thin films have
been used as metal ion precursors to
produce the first examples of mesoporous silica metal sulfide (mesoSiO2@ZnS, meso-SiO2@CdS) or silica
metal selenide (meso-SiO2@ZnSe,
meso-SiO2@CdSe) thin films, in which
the pore walls are made up of silica
and metal sulfide or metal selenide
nanoflakes, respectively. A gentle
chemical etching with a dilute HF solution of the meso-SiO2@CdS (or mesoSiO2@CdSe) produces mesoporous
cadmium sulfide (meso-CdS) (or cadmium selenide, meso-CdSe). Surface
modified meso-CdS displays bright
blue photoluminescence upon excitation with a UV light. The mesoporous
silica metal oxides are formed as metal
oxide nanoislands over the silica walls
through a self-assembly process of a
mixture of metal nitrate salt-two surfactants-silica source followed by calcination step. The reactions, between the
H2S (or H2Se) gas and solid precursors,
have been carried out at room temperature and monitored using spectroscopy and microscopy techniques. It has
been found that these reactions are:
1) taking place through the diffusion of
sulfur or selenium species from the top
metal oxide layer to the silica metal
oxide interface and 2) slow and can be
stopped at any stage to obtain mesoporous silica metal oxide metal sulfide or
silica metal oxide metal selenide intermediate thin films.
DOI : 10.1002/chem.201102643
Anahtar Kelimeler : Mesoporous Materials, Metal Selenides, Metal Sulfides, Nanomaterials, Thin Films, Article
Cilt: 18
Sayı: 12
ISSN: 0947-6539
Sayfa: 3695-3705
Sınıflandırma :
18
Change Point Identification of Key Water Quality Parameters in Lake Taihu
Bildiri Serisi

Bildiri Serisi
Kaynak :
DSpace Makaleler
Dergi:
CHEMISTRY-A EUROPEAN JOURNAL
Yayıncı:
CHEMISTRY-A EUROPEAN JOURNAL
Yazar(lar) :
Dilek Eren AKYÜZ
Konu :
Mühendislik ve Teknoloji, Mühendislik, Mühendislik, Bilişim ve Teknoloji (ENG)
Yıl :
2021
CHEMISTRY-A EUROPEAN JOURNAL
Yayıncı Web Sitesi
Kaydet
Anahtar Kelimeler : Mühendislik ve Teknoloji, Mühendislik, Mühendislik, Bilişim ve Teknoloji (ENG), Bildiri
Sınıflandırma :
19
Partial oxidation as a rational approach to kinetic control in bioinspired magnetite synthesis
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Chemistry - A European Journal
Yazar(lar) :
C.L. Altan , J.J.M. Lenders , P.H.H. Bomans , G. De With , H. Friedrich , S. Bucak , N.A.J.M. Sommerdijk
Konu :
Biomimetic synthesis, Crystal growth, Magnetic properties, Magnetite, Nanoparticles
Yıl :
2015
Chemistry - A European Journal
Yayıncı Web Sitesi
Kaydet
Biological systems show impressive control over the shape, size and organization of mineral structures, which often leads to advanced physical properties that are tuned to the function of these materials. Such control is also found in magnetotactic bacteria, which produce - in aqueous medium and at room temperature - magnetite nanoparticles with precisely controlled morphologies and sizes that are generally only accessible in synthetic systems with the use of organic solvents and/or the use of high-temperature methods. The synthesis of magnetite under biomimetic conditions, that is, in water and at room temperature and using polymeric additives as control agents, is of interest as a green production method for magnetic nanoparticles. Inspired by the process of magnetite biomineralization, a rational approach is taken by the use of a solid precursor for the synthesis of magnetite nanoparticles. The conversion of a ferrous hydroxide precursor, which we demonstrate with cryo-TEM and low-dose electron diffraction, is used to achieve control over the solution supersaturation such that crystal growth can be regulated through the interaction with poly-(?,ß)-DL-aspartic acid, a soluble, negatively charged polymer. In this way, stable suspensions of nanocrystals are achieved that show remanence and coercivity at the size limit of superparamagnetism, and which are able to align their magnetic moments forming strings in solution as is demonstrated by cryo-electron tomography. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA. Koninklijke Hollandsche Maatschappij der Wetenschappen Technische Universiteit Eindhoven
Anahtar Kelimeler : Biomimetic synthesis, Crystal growth, Magnetic properties, Magnetite, Nanoparticles, article

ISSN: 09476539
20
“Clicked” Porphyrin-cucurbituril conjugate: a new multifunctional supramolecular assembly based on triglycosylated porphyrin and Monopropargyloxycucurbit7uril
Dergi Makalesi

Dergi Makalesi
Open Access
Kaynak :
DSpace Makaleler
Dergi:
Chemistry - A European Journal
Yayıncı:
Wiley-VCH Verlag
Yazar(lar) :
Ahmet Koç , Rehan Khan , Dönüş Tuncel
Konu :
Drug delivery, Photosensitizers, Porphyrinoids, Singlet oxygen, Supramolecular chemistry
Yıl :
2018
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
The design, synthesis, and characterization of a new multifunctional supramolecular assembly based on a photoactive glycosylated porphyrin and covalently attached monofunctionalized cucurbit[7]uril (CB7) are reported. To obtain the target supramolecular assembly, azido-functionalized tetraphenylporphyrin (TPP) was used as a building block. TPP was first glycosylated by copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction, then a monopropargyloxy-functionalized-CB7 unit was conjugated to glycosylated TPP with a second CuAAC reaction. The host-guest chemistry of the assembly was investigated by 1H NMR experiments to establish the availability of the CB7 as a host. The imidazole-based guest, which is known to have high affinity toward CB7, was observed to form inclusion complex with CB7. It was also demonstrated that this supramolecular assembly can serve as an efficient photosensitizer for the generation of singlet oxygen.
DOI : 10.1002/chem.201804024
Anahtar Kelimeler : Drug delivery, Photosensitizers, Porphyrinoids, Singlet oxygen, Supramolecular chemistry, Article
Cilt: 24
Sayı: 58
ISSN: 0947-6539 (print)
Sayfa: 15550-15555
Sınıflandırma :
Kimya %100
Organik Kimya %94
21
On the Electronic Structure of Ethidium
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
Chemistry - A European Journal
Yazar(lar) :
Nathan W. Luedtke , Qi Liu , Yitzhak Tor
Yıl :
2005
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
DOI : 10.1002/chem.200400559
ISSN: 0947-6539
Sayı: 2
Cilt: 11
Sayfa: 495-508
Sınıflandırma :
22
Efficient End-Capping Synthesis of Neutral Donor-Acceptor 2Rotaxanes Under Additive-Free and Mild Conditions
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
Chemistry - A European Journal
Yazar(lar) :
Yuya Domoto , Shohei Sase , Kei Goto
Yıl :
2014
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
DOI : 10.1002/chem.201404187
ISSN: 0947-6539
Sayı: 48
Cilt: 20
Sayfa: 15998-16005
23
Artificial Neural Networks for Guest Chirality Classification through Supramolecular Interactions
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
Chemistry - A European Journal
Yazar(lar) :
Jarosław M. Granda , Janusz Jurczak
Yıl :
2014
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
DOI : 10.1002/chem.201404081
ISSN: 0947-6539
Sayı: 39
Cilt: 20
Sayfa: 12368-12372
24
Spotlights on our sister journals: Chem. Eur. J. 38/2014
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
Chemistry - A European Journal
Yıl :
2014
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
DOI : 10.1002/chem.201483813
ISSN: 0947-6539
Sayı: 38
Cilt: 20
Sayfa: 11974-11977
25
Back Cover: Enhanced Thermal Oxidation Stability of Reduced Graphene Oxide by Nitrogen Doping (Chem. Eur. J. 38/2014)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
Chemistry - A European Journal
Yazar(lar) :
Stefania Sandoval , Nitesh Kumar , A. Sundaresan , C. N. R. Rao , Amparo Fuertes , Gerard Tobias
Yıl :
2014
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
DOI : 10.1002/chem.201490161
ISSN: 0947-6539
Sayı: 38
Cilt: 20
Sayfa: 12324-12324
26
Back Cover: Gold-Catalyzed Cycloisomerization of 1,6,8-Dienyne Carbonates and Esters tocis-Cyclohepta-4,8-diene-Fused Pyrrolidines (Chem. Eur. J. 41/2014)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
Chemistry - A European Journal
Yazar(lar) :
Weidong Rao
Yıl :
2014
Chemistry - A European Journal
Yayıncı Web Sitesi
Tam Metin
Kaydet
DOI : 10.1002/chem.201490173
ISSN: 0947-6539
Sayı: 41
Cilt: 20
Sayfa: 13408-13408

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