Results 141 to 150 of about 2,979 (191)

Photodegradation of cyanine and merocyanine dyes

Dyes and Pigments, 2001
The photodegradation kinetics for some cyanine and merocyanine dyes was studied by UV-visible spectroscopy and the results show that the fading process follows quasi-first-order or zero-order kinetics in acetonitrile. In other experiments, the principal photodegradation products of the dyes were identified with the aid of GC/MS, and it was found that ...
Songjie Yang, He Tian, Heming Xiao, Xinghong Shang, Xuedong Gong, Side Yao, Kongchang Chen   +6 more
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Phenothiazinyl Rhodanylidene Merocyanines for Dye-Sensitized Solar Cells

The Journal of Organic Chemistry, 2012
Phenothiazinyl rhodanylidene acetic acid merocyanine dyes with variable substitution pattern on the peripheral benzene ring were synthesized in good to excellent yields by Knoevenagel condensation of the corresponding phenothiazinyl aldehydes and rhodanine-N-acetic acid. The electronic properties were investigated by cyclic voltammetry, absorption, and
Tim, Meyer, Daniel, Ogermann, Andrea, Pankrath, Karl, Kleinermanns, Thomas J J, Müller   +4 more
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Antimicrobial activity of merocyanine 540: a photosensitizing dye

Diagnostic Microbiology and Infectious Disease, 1998
The antimicrobial activity of merocyanine 540 (MC 540), a photosensitizing dye previously used to purge malignant cells from autologous bone marrow grafts, was evaluated against a panel of Gram-positive and Gram-negative bacteria and Candida albicans in the presence and absence of light.
W M, Dunne, W A, Slater
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Configuration of photoisomers of merocyanine dyes

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1976
1. The photoisomerization of merocyanine dyes occurs at the singlet and triplet electron-excited levels. Two photoisomers are formed at the singlet level, a short-lived and a long-lived isomer, while only the degradation of the energy of electronic excitation, with the formation of a long-lived isomer, is possible from the triplet state. 2.
V. A. Kuz'min, A. M. Vinogradov, N. N. Romanov, M. A. Al'perovich, I. I. Levkoev, F. S. Babichev   +5 more
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Sulfur- and selenium-containing merocyanine dyes

Chemistry of Heterocyclic Compounds, 1975
The corresponding merocyanine dyes were obtained by reaction of aminomethylene derivatives of 5-pyrazolone and 5-thio- and 5-selenopyrazolones with tetramethylindoleninium and phenanthridinium salts. Their UV spectra and the possibility of the formation of spiropyrans from them were studied.
I. Ya. Kvitko, V. P. Martynova, R. P. Ponomareva, N. S. Fedorova   +3 more
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Merocyanine dyes: synthesis, structure, properties and applications

Russian Chemical Reviews, 2009
Key approaches to the synthesis of merocyanine dyes are summarised. The dependence of the dye properties on their chemical structure, the solvent nature and the aggregation type is analysed. The main methods of studying the electronic structure of merocyanines are considered. Attention is focused on polyene–polymethine electron transitions.
A V Kulinich, Aleksandr A Ishchenko
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Photoisomerization of a sterically constrained merocyanine dye

Journal of the Chemical Society, Faraday Transactions, 1998
A particular concern regarding the photophysical properties of merocyanine 540 derivatives, and related cyanine dyes, involves identifying which double bond in the central polyenic bridge undergoes light-induced isomerization. In order to address this issue we have synthesized a novel merocyanine dye in which the first double bond is built into a ...
Andrew C. Benniston, Anthony Harriman
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Photosensitizing Merocyanine Dyes Based on Selenobarbituric Acid

Phosphorus, Sulfur, and Silicon and the Related Elements, 1992
Abstract Structural analogs of Merocyanine 540 (MC540) were synthesized to probe biological mechanisms of action and to enhance viral inactivation. Novel pyrimidine-2- selone analogs of known and modified merocyanine sensitizers are described.
Wolfgang H.H. Günther, Roger Searle, Fritz Sieber   +2 more
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ELECTRON SPIN RESONANCE IN LANGMUIR FILMS OF MEROCYANINE DYES

Thin Solid Films, 1983
Abstract Electron spin resonance measurements were performed on Langmuir films of merocyanine dyes with three different donor nuclei at room temperature and 77 K. Each system showed a single anisotropic resonance line with a g factor close to 2.00. The spin concentration and its change due to illumination were markedly dependent on the donor nuclei ...
Shin-Ichi Kuroda, Michio Sugi, Sigeru Iizima   +2 more
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X-ray photoelectron spectroscopy of merocyanine dyes

Journal of Electron Spectroscopy and Related Phenomena, 1987
Abstract Smyth's equation for calculating the partial ionic character of bonds yields better results than Pauling's equation when the electronegativity difference between the bonded atoms exceeds unity. This equation is used to establish the following binding energy/partial charge correlation for the O1s line:O1s binding energy (eV) = 534.55 + 3.29 q.
Mohamed M. Chehimi, Michel Delamar
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