SOLVENT EFFECTS ON TRIPLET LIFETIMES---BENZENE AT LOW TEMPERATURES
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Date
1970
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Publisher
Ohio State University
Abstract
The lifetime of the lowest benzene triplet state has been shown recently to be strongly dependent, upon temperature, even near $77^\circ K$. We report here on the solvent dependence of the phosphorescence lifetime of benzene and methylbenzenes in the low temperature limit. At $4.2^\circ K$ the lifetime of $C_{5} D_{6}$ varies from 12.5 to 26.5 seconds depending upon the solvent. The shortest lifetimes are found with solvents which have excited states closest in energy to those of benzene. There is some indication of the formation of a weak exciplex and subsequent radiationless decay. The longest lifetimes are found with perfluorocarbon solvents (e.g., $C_{2}$ $F_{12}$).
Description
Present address of G. C. Nieman: Department of Chemistry, Muskingum College, New Concord, Ohio 13762.""
Author Institution: Department of Chemistry, University of Rochester
Author Institution: Department of Chemistry, University of Rochester