Results 131 to 140 of about 2,979 (191)

Synthesis and spectroscopic properties of some merocyanine dyes

Dyes and Pigments, 2001
The reaction between some 1,1-diarylprop-2-yn-1-ols 3 and cyclohexane-1,3-diones affords merocyanine dyes 7, the valence tautomers of the tetrahydro-2H-[1]benzopyrans. The spectroscopic properties of these dyes are discussed. The isomeric merocyanine dyes 14 and 15 derived from the reaction of 1,1-bis(4-dimethyl-aminophenyl)prop-2-yn-1-ol and 2 ...
Christopher D Gabbutt
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Design and Photonics of Merocyanine Dyes

The Chemical Record, 2023
AbstractMerocyanines, thanks to their easily adjustable electronic structure, appear to be the most versatile and promising functional dyes. Their D–π–A framework offers ample opportunities for custom design through variations in both donor/acceptor end‐groups and the π‐conjugated polymethine chain, and leads to a broad range of practical properties ...
Andrii V, Kulinich, Alexander A, Ishchenko   +1 more
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Merocyanine Dyes with Improved Photostability

Organic Letters, 2007
Merocyanine dyes have proven valuable for live cell fluorescence imaging applications, but many structures have been limited by rapid photobleaching. We show that photostability is substantially enhanced for merocyanines having a cyano group at a specific position in the central polymethine chain.
Alexei, Toutchkine, Dan-Vinh, Nguyen, Klaus M, Hahn   +2 more
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Merocyanine and Photomerocyanine Dyes

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 2000
Abstract We give a review of results from work on merocyanines (MC) and photomerocyanines (PMC) reporting the most stable isomeric forms from X-ray structural and NMR spectral analysis. We also give new X-ray data, 1H-1H NOESY, 1H and 13C-NMR results for MC's.
Jonathan Hobley, Vincenzo Malatesta, Roberto Millini, Wallace O'Neil Parker   +3 more
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Merocyanine dyes: self-assembled monolayers

Journal of Materials Chemistry, 2002
4-{2-[N-(10-Thiodecyl)quinolinium-4-yl]vinyl}phenolate self-assembles on gold with a contact area of 0.35 ± 0.03 nm2 molecule−1, monolayer thickness of 1.64 ± 0.07 nm, and dielectric permittivity components of er ≈ 2.8 and ei ≈ 0.6 at 632.8 nm, which are reduced to ca. 2.0 and 0 respectively when exposed to an acidic medium.
Geoffrey J. Ashwell, Gary A. N. Paxton, Anne J. Whittam, Wayne D. Tyrrel, Martial Berry, Dejian Zhou   +5 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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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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Demystifying the solvatochromic reversal in Brooker’s merocyanine dye

Phys. Chem. Chem. Phys., 2011
Based 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., Kongsted, Jacob, Rinkevicius, Zilvinas, Ågren, Hans   +3 more
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Photoisomerization of sterically hindered merocyanine dyes

Journal of the Chemical Society, Faraday Transactions, 1997
A 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, Anthony Harriman, e McAvoy   +2 more
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ChemInform Abstract: MEROCYANINE DYES FROM PERFLUOROQUINONES

Chemischer Informationsdienst, 1977
AbstractDurch 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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