Photoisomerization of ketocyanines

Dyadyusha, G. G.; Rykov, A. A.; Slominskii, Yu. L.

doi:10.1007/bf00519625

Cited by 1 publication

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“…Along with such simple dyes, a number of bichromophoric dyes were synthesized (e.g., biscyanine dyes [1]), which possess interesting photochemical properties different from those of simple dyes. In the three recent decades, two new classes of bichromophoric cyanine dyes were obtained, ketocyanines [2,3,4] and cationanionic dyes [5]. Ketocyanine dyes (polyenic bis-ω, ωaminoketones) consist of two ω-aminopolyenic units bound to the central carbonyl group; cation-anionic dyes contain in their structure cationic and anionic polymethine dyes.…”

Section: Introductionmentioning

confidence: 99%

Effects of chromophore interaction in photophysics and photochemistry of cyanine dyes

Татиколов

Krasnaya

Шведова

et al. 2000

International Journal of Photoenergy

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Spectral and fluorescent properties of ketocyanine dyes (polyenic bis-ω,ω′-aminoketones) and cation-anionic polymethine dyes of various structures were studied. The symmetric ketocyanines were shown to have a long-wavelength absorption band bathochromically shifted in comparison with that of the asymmetric ketocyanines with the same total length of the polyenic chain. The nonlinear ketocyanines exhibit the additional short-wavelength band in their absorption spectra, which can be more intense than the longwavelength band. The absorption spectra of ion pairs of cation-anionic dyes with overlapping cation and anion bands contain a new intense short-wavelength band inactive in fluorescence excitation. These spectral peculiarities are explained on the basis of chromophore interaction model. It has also been shown that theT1levels of ketocyanine chromophores do not essentially interact with each other in a ketocyanine molecule in nonpolar solvents; in polar solvents this interaction becomes appreciable due to lowering the potential barrier for conjugation.

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Section: Introductionmentioning

confidence: 99%