O. Santos, A. C. Testa, M. O'Sullivan
1983
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Journal
Journal of Photochemistry
Abstract
Abstract A flash photolysis study of 1-phenylpyrrole indicates that a major primary event is fission of the phenyl—pyrrolyl bond, leading to radicals which recombine as well as react. A variable-temperature study in isopropyl alcohol indicates that this process still occurs at − 95 °C; however, a second photochemical event requiring diffusion and thermal activation is removed upon cooling. The observation of a 360 nm transient with a half-life of 0.5 ms in four different solvents is attributed to the triplet-triplet absorption of biphenyl. The formation of 2-phenylpyrrole absorbing at 290 nm provides further evidence for the primary event leading to phenyl radicals.