Organic Charge Transfer Salts. II. Emission Spectrum of an Organic Charge Transfer Salt, 2,4,6-Triphenylthiopyrylium–1,1,3,3-tetracyanopropenide

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The emission spectrum of an organic charge transfer salt, 2,4,6-triphenylthiopyrylium–1,1,3,3-tetracyanopropenide, was studied in solutions of various solvents as well as in the solid state. A charge transfer fluorescence was observed both in the solid state and in non-polar rigid solution at 77 K, but not in fluid solution. In rigid solution, as the polarity of solvent increases, the charge transfer fluorescence shows a blue shift of its maximum wavelength and a remarkable decrease in intensity, the phosphorescence of a dissociated cation appearing predominantly. The strong dependence of the emission spectrum on the solvent polarity was explained in terms of the dissociation of the salt and the insufficient reorientation of solvent molecules around the salt in the excited charge transfer state.
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