Abstract
Abstract Electron transfer from the triplet state of xanthene dyes (F1In2− and F1Brn2−, n = 2, 3, and 4) to methylviologen (MV2+) was investigated with a laser flash photolysis technique. Efficiency for the charge separation in aqueous organic solution to give free radical ions, F1In−• or F1Brn−• and MV+•, increased almost linearly with increasing mole fraction of added organic solvents such as acetonitrile, acetone, dioxane, ethanol, methanol, and DMSO in the decreasing order of efficiency. The effect of organic solvents on dissociation of radical ion pairs tends to increase with decrease of their hydrogen-accepting property expressed by Taft’s β value. Halogen-atom substitution in F1In2− and F1Brn2− reduced the MV+ yield, and this heavy-atom effect is associated with increase in the rate of recombination of triplet radical ion pairs accompanying spin inversion.
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