TY - JOUR
T1 - Viscosity independence of the ratio of fluorescence lifetimes and quantum yields of ω-substituted 4- dimethylamino-trans-styrenes
AU - Kawski, Alfons
AU - Gryczyński, Ignacy
AU - Bojarski, Piotr
AU - Nowaczyk, Kazimierz
N1 - Funding Information:
The authors wish to thank Dr. Dieter Gloyna for the gift of the chemical compounds. This work was supported by grant No. 202839101 from the Committee for Scientific Research (Warsaw) and performed partially at the Center for Fluorescence Spectroscopy NSF DIR-8710401.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1992/9/15
Y1 - 1992/9/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0040543605&partnerID=8YFLogxK
U2 - 10.1016/1010-6030(92)85182-T
DO - 10.1016/1010-6030(92)85182-T
M3 - Article
AN - SCOPUS:0040543605
SN - 1010-6030
VL - 68
SP - 185
EP - 190
JO - Journal of Photochemistry and Photobiology, A: Chemistry
JF - Journal of Photochemistry and Photobiology, A: Chemistry
IS - 2
ER -