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Picosecond spectroscopic study of the influence of the solvent on the photoisomerization and relaxation of a streptocyanine dye.

✍ Scribed by S.K. Rentsch; R.A Gadonas; A. Piskarskas

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
322 KB
Volume
104
Category
Article
ISSN
0009-2614

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✦ Synopsis

The photophysics of bisdimethylaminoheptamethine perchlorate dissolved in a series of alcohols has been studied. The absorption difference spectrum AD(h, t) exhibits S 1-S n absorption, So-S 1 band bleaching, induced fluorescence and, after a delay upon optical excitation, photoisomer absorption. The S 1 state depletion proceeds exponentially. GSR curves indicate a number of non-relaxed molecules which undergo photoisomerization. Photoisomer formation was evidenced by an increasing photoisomer absorption. All processes proceed more slowly in more viscous solvents. The isomefization quantum yield is found to be independent of solvent viscosity.

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