Viscosity independence of the ratio of fluorescence lifetimes and quantum yields of ω-substituted 4- dimethylamino-trans-styrenes

Alfons Kawski, Ignacy Gryczynski, Piotr Bojarski, Kazimierz Nowaczyk

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The fluorescence lifetimes τ and quantum yields φF of 4-dimethylamino-ω-diphenylphosphinyl- trans-styrene (2a) and 4-dimethylamino-ω-methylsulphonyl-trans-styrene (3a) were measured in n-paraffins (n = 6 to n = 16) at 293 K. The ratio τ/φF was found to be viscosity independent and equal to the radiative lifetime τ0′ calculated from the integrated absorption spectrum. The strong fluorescence quenching and the shortening of the lifetime τ when reducing the viscosity are due to twisting around the double bond, resulting in trans-cis isomerization.

Original languageEnglish
Pages (from-to)185-190
Number of pages6
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Volume68
Issue number2
DOIs
StatePublished - 15 Sep 1992

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