DEUTERIUM, METHYL, AND SOLVENT EFFECTS ON THE PHOSPHORESCENCE LIFETIME OF BENZENE
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Date
1972
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Ohio State University
Abstract
The phosphorescence lifetimes of benzene and a number of its methyl and deutero derivatives have been investigated in a wide variety of solvents at temperatures below $65^{\circ} K$. Deuterium effects indicate a dominant role for the aryl hydrogens in the radiationless process. Methylation increases the triplet decay rate by approximately 25\% per methyl group in a nearly linear fashion. Intensity data indicate that this is not due to ``allowed’’ character introduced by any reduction in molecular symmetry as is theoretically predicted to be the case. Perfluorocarbons act as inert solvents for benzene derivatives whereas typical hydrocarbons produce 50\% or greater changes in the lifetimes even at very low temperatures. The data suggest a common mechanistic pathway (or perturbed state) for both the effects of solvent and methyl groups.
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Author Institution: Department of Chemistry, University of Rochester; Department of Chemistry, Muskingum College