Abstract
The EPR spectra of the triplet excitons in a single crystal of tetraethylammonium 2,3-dichloro-5,6-dicyano p-benzosemiquinone are studied in detail. Principal values and directions of the fine structure tensor D and of the g tensor are obtained and discussed. The spin distribution in the dimers is shown to be the same as in the isolated molecules by comparing the g factor of the triplet exciton with that of the radical in solution and by comparing the experimental D tensor with the calculated one with spin densities which describe the unpaired electron in the isolated molecule. From the temperature dependence of the EPR spectrum the triplet exciton activation energy E T = 0.37 eV, the exciton—exciton exchange activation energy E w = 0.41 eV, the intra- and inter-stacks exciton hopping frequency μ j = 1.6 × 10 4 MHz and μ t = 0.2 MHz are obtained. fa]This work was supported in part by the National Research Council of Italy (C.N.R.) through its Centro di Studio sugli Stati Molecolari Radiacalici ed Eccitati.
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