Results 141 to 150 of about 983 (189)

Merocyanine–spiropyran relaxation processes

The European Physical Journal D, 2018
In the paper mechanisms of merocyanine–spiropyran transformation were investigated. It was shown that in dark conditions for such transformation it is necessary to overcome the potential barrier with height of ~0.6 eV. A barrierless transformation into the spiropyran molecule is possible due to the rotation of the phenyl moiety of the merocyanine ...
Olha Kovalenko, Yuriy Lopatkin, Petro Kondratenko, Dmitro Belous   +3 more
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Theoretical study of spiropyran–merocyanine thermal isomerization

Chemical Physics Letters, 2004
Quantum mechanical computations at DFT level were carried out on the processes involved in the thermal reaction SP¡ME, where SP is the nitro-substituted spirobenzopyran (1',3'-dihydro-1',3',3'-trimethyl-6-nitro-spiro[2H-1-benzopyran-2,2'- [2H]indole]) in the closed form and ME is the corresponding open form.
Grazia Cottone, Rosina Noto, Gianfranco La Manna   +2 more
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Spectroscopic Studies on Brooker's Merocyanine

Journal of the American Chemical Society, 1998
The origin of the multiple absorption bands of Brooker's merocyanine, 1-(4-aza-4-methylphenyl)-2-trans-(4-oxyphenyl)ethene, found in the visible region of the spectrum in solvents such as chloroform and tetrahydrofuran, has been explored experimentally using 1H and 13C NMR spectroscopy and theoretically using molecular orbital methods.
John O. Morley, Richard M. Morley, Ann L. Fitton   +2 more
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Merocyanines: Synthesis and Application

2008
The rapid progress of information technology continues to stimulate the exploration of innovative materials and architectures for digital processing. Merocyanine dyes appear to be potential candidates for the realization of future data-elaboration, -storage, and -communication devices.
Valerii Z. Shirinian, Alexey A. Shimkin
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Spectroscopic studies on merocyanine photoisomers. III. Redox potentials and spectral shifts of merocyanine photoisomers.

NIPPON KAGAKU KAISHI, 1989
ジメチン型メロシアニンは可視光によってシス-トランス異性化を起こし, シス化にともなって極大吸収波長はすべて長波長シフトする。ポリメチンでは短波長シフトする例が多いとされているが, メロシアニンではどのような機構により逆の性質が現われるのかを調べるため, HOMO, LUMO と強い相関がある酸化電位 (Eox), 還元電位 (Ered) を測定した。光異性化にともなう酸化還元電位の変化を測定した例はこれがはじめてである。熱異性化速度がいちじるしく遅いため光異性体を唯一単離しえた MD-CO の Eox は trans-, cis- でそれぞれ 0.362, 0.340V (vs.
Hitoshi FUNAKOSHI, Keietsu TAMAGAKE, Yuzaburo FUJITA   +2 more
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Merocyanine Aggregation in Mesoporous Networks

Journal of the American Chemical Society, 1996
Nanocrystalline films of TiO2, Al2O3, and ZrO2 were used as hosts for the merocyanine 3-acetyl-5-(2-(3-ethyl-2-benzothiazolidinylidene)ethylidene)rhodanine (Mc2) to scrutinize templating effects in the accommodation of the dye within their porous network.
F. Nüesch, J. E. Moser, V. Shklover, M. Grätzel   +3 more
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Merocyanine-type dyes from barbituric acid derivatives

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2001
The 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, P, Campodonico, E, Abuin, J, Kossanyi   +3 more
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Fundamental Studies on Brooker's Merocyanine

Journal of the American Chemical Society, 1997
The spectroscopic properties of solvent soluble derivatives of Brooker's simple merocyanine 4-[(1-methyl-4(1H)-pyridinylidene)ethylidene]-2,5-cyclohexadien-1-one, which can in principle exist in two distinct canonical forms, have been assessed both experimentally and theoretically using molecular orbital methods.
John O. Morley, Richard M. Morley, Robert Docherty, Michael H. Charlton   +3 more
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Photochemical Activity of Merocyanine Dyes

International Journal of Thermophysics, 2009
Time-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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Distribution of merocyanine 540 in phospholipid membranes

Journal of Fluorescence, 1993
The interaction of the fluorescent photosensitizer merocyanine 540 (MC-540) with model phospholipid membranes was studied. Two different-colored species (monomers and dimers) of MC-540 were registered in phospholipid liposomes. Variations in both phospholipid composition (DMPC, DPPC, POPC, egg PC) and temperature (15-60°C) resulted in changes in the MC-
L, Sikurová, R, Franková
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