Abstract
Solvent deuteration effects on internal conversion (S 1 ∼→ S 0) and intersystem crossing (S 1 ∼→ T 1) in 6-hydroxy-9-phenylfluoron and fluorescein were determined from fluorescence and triplet quantum yield measurements in alkaline solutions of H 2O, D 2O, CH 3OH, CH 3OD, C 2H 5OH, and C 2D 5OD. Deuterium substitution of the oxygen-bonded hydrogens of these solvenis reduces both the internal conversion (by approximately 1.6) and the intersystem crossing (by approximately 1.2) rate constants; the additional deuteration of the alkyl groups of the alcohols does not produce any further effect. The effect of solvent deuteration was negligible for fluorescein. Deuteration of the xanthene groups of the dyes does not influence the radiationless transition probabilities to any significant extent.
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