Results 211 to 220 of about 10,562 (252)

Essential States Model for Merocyanine Dye Stacks: Bridging Electronic and Optical Absorption Properties

Journal of Physical Chemistry C, 2019
An extension of the essential states model is developed to investigate the absorption and electronic properties of a highly dipolar merocyanine dye and double and quadruple π-stacks formed upon the...
D. Bialas, Chuwei Zhong, F. Würthner, F. Spano   +3 more
semanticscholar   +1 more source

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
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source

Bis(merocyanine) Hetero-Folda-dimers: Evaluation of Exciton Coupling Between Different Types of π-stacked Chromphores.

Chemistry, 2019
Exciton coupling between different types of chromophores has been rarely investigated. Herein we present a systematic study on the exciton coupling between merocyanine chromophores of different conjugation length with varying excited state energies.
Eva Kirchner, D. Bialas, F. Würthner
semanticscholar   +1 more source