Abstract

In this paper the results of studies of the time‐resolved fluorescence spectra of a weak electron‐donor‐acceptor systems of tetracyanobenzene with mesitylene (and toluene) are presented. A strong dependence of observed spectra at room and low temperature (under restricted diffusion conditions) and the lack of interrelation between decay parameters determined for different spectral regions are discussed in terms of existence of this EDA systems in a number of different orientational isomers. The results of computations of potential energy surfaces of the ground and excited state for TCNB‐mesitylene system are supporting this hypothesis.

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