Results 131 to 140 of about 2,975 (190)
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Photochemical Activity of Merocyanine Dyes
International Journal of Thermophysics, 2009Time-resolved photothermal responses of merocyanine dyes were used to estimate such parameters as the quenching rate constant of dye triplet states and dye capability of singlet oxygen generation, which are helpful in explanation of the dye photochemical activity.
A. Dudkowiak, E. Teślak, B. Olejarz
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Merocyanine-type dyes from barbituric acid derivatives
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2001The preparation and the solvatochromic behavior of two dyes, obtained by condensation of N,N'-dimethylbarbituric acid with dimethylaminobenzaldehyde and with 4,4'-bis(N,N-dimethylamino)benzophenone (Michler's ketone) are described. The latter dye is rather sensitive to the polarity of the medium, and in particular, to the hydrogen-bond-donor ability of
M C, Rezende +3 more
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Demystifying the solvatochromic reversal in Brooker’s merocyanine dye
Phys. Chem. Chem. Phys., 2011Based on hybrid QM/MM simulation techniques, we rationalize the spectacular solvatochromic reversal behavior observed for a stilbazolium merocyanine (SM) called Brooker's merocyanine dye. This solvatochromic reversal is attributed to a change in the solute π-electron distribution from zwitterionic to neutral following the change in solvents from polar ...
Murugan, N.A. +3 more
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Photoisomerization of sterically hindered merocyanine dyes
Journal of the Chemical Society, Faraday Transactions, 1997A small series of merocyanine dyes has been synthesized in which substituents are incorporated into the polymethine backbone. The substituent perturbs the local structure in the polyenic bridge, as evidenced by changes to the bond order, the valence electronic charge on certain bridging carbon atoms, the bond length alternation, and the torsion angle ...
Andrew C. Benniston +2 more
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ChemInform Abstract: MEROCYANINE DYES FROM PERFLUOROQUINONES
Chemischer Informationsdienst, 1977AbstractDurch Kondensation der Methylenbasen (III) mit Tetrafluorbenzochinon (II) oder Perfluor‐l ,4‐naphthochinon (IV) erhält man Merocyanine gemäß (I) und (V).
G. A. LEZENKO, A. YA. IL'CHENKO
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Photodegradation of cyanine and merocyanine dyes
Dyes and Pigments, 2001The 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 +6 more
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Phenothiazinyl Rhodanylidene Merocyanines for Dye-Sensitized Solar Cells
The Journal of Organic Chemistry, 2012Phenothiazinyl 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 +4 more
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Antimicrobial activity of merocyanine 540: a photosensitizing dye
Diagnostic Microbiology and Infectious Disease, 1998The 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, 19761. 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 +5 more
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Sulfur- and selenium-containing merocyanine dyes
Chemistry of Heterocyclic Compounds, 1975The 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 +3 more
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