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Excited-state dynamics and viscosity-dependent internal conversion in 3,3-dimethyl-2-phenyl-3H-indole by Michel Belletête; Ranjit S. Sarpal; Gilles Durocher is a Physics and Astronomy article available to read on EtoBox.

What is Excited-state dynamics and viscosity-dependent internal conversion in 3,3-dimethyl-2-phenyl-3H-indole about?

The fluorescence quantum yields and lifetimes ( rF) of 3,Mimethyl-2-phenyl-3H-indole (1 ), in a series of eighteen nonpolar, polar aprolic and/or protic solvents, range from 2.4~ 10m4 to 0.12 and from 1 to 520 ps, respectively, as a result of viscosity dependent fast internal conversion. Rates of internal conversion are shown to be dependent upon the bulk viscosity of the solvent as opposed to the microviscosity (free volume effect of the solvent). Both &and TV were found to vary with solvent viscosity (q) according to a F&ster-Hoffmann mechanism: & (or TV) = Cq \*I3 with an identical value of C whatever the nature of the solvent is. This molecule may then be regarded as an excellent viscosity probe for heterogeneous systems and polymers over a large range of viscosities. Various solvatoehromic methods have been used to evaluate the ground and excited state dipole moments of 1. The Bilot-Kawski method gives optimized values of 3.8 and 7.8 D, respectively, with a negligible polariaability of the molecule.

Who reads Excited-state dynamics and viscosity-dependent internal conversion in 3,3-dimethyl-2-phenyl-3H-indole?

Author

Michel Belletête; Ranjit S. Sarpal; Gilles Durocher

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0009-2614)

Published

1993

Language

EN

Field

Physics and Astronomy (Physical Sciences)