Issue 11, 2009

Viscosity dependence of rubrene fluorescence quenching by organic radicalsvia energy transfer

Abstract

The kinetics of rubrene (5,6,11,12-tetraphenylnaphthacene) fluorescence quenching by energy transfer to the radicals of N,N,N′,N′-tetramethyl-para-phenylenediamine (TMPD+˙), tetracyanoquinonedimethane (TCNQ˙) and galvinoxyl (2,6-di-tert-butyl-alpha-(3,5-di-tert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)-p-tolyloxy; GAL˙), have been measured in solvents of different viscosities. At room temperature the observed quenching rate constants vary between 0.12 and 7.8 × 1010 M−1 s−1, always exceeding the diffusion rate constants given by the simplest version of Smoluchowski theory combined with the rate constants for dipole–dipole energy transfer. This discrepancy is explained by accounting for the non-stationary stage in the Förster kinetics, even though the experimental fluorescence decays are apparently mono-exponential.

Graphical abstract: Viscosity dependence of rubrene fluorescence quenching by organic radicals via energy transfer

Article information

Article type
Paper
Submitted
04 Feb 2009
Accepted
07 Sep 2009
First published
21 Sep 2009

Photochem. Photobiol. Sci., 2009,8, 1595-1602

Viscosity dependence of rubrene fluorescence quenching by organic radicals via energy transfer

G. Grampp, M. Justinek, S. Landgraf, G. Angulo and N. Lukzen, Photochem. Photobiol. Sci., 2009, 8, 1595 DOI: 10.1039/B902433F

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