Abstract
Photosensitized pyrimidine dimer splitting by a covalently linked methoxybenzene exhibited a strong solvent dependence. Fluorescence of the chromophore was quenched by the attached dimer, which was indicative of electron tranfer from excited chromophore to dimer. The quantum efficiency of splitting of teh dimer radical anioin in the linked dimer .- -chromophore .+ was calculated from the observed quantum yields of splitting and the degree of fluorescence quenching. The quantum efficeincy of dimer radical anion splitting was remarkably dependent on solvent polarity, ranging from 0.05 in cater to -0.5 in low polarity solvent mixtures (e.g., heptane/1,4-dioxane, 95:5
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