Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Direct Observation of the 1,4-Biradical of Benzophenone with cis-3-Methyl-2-pentene Excited by the Fourth Harmonic of a Nd:YAG Laser
Hisaharu Hayashi
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1980 Volume 53 Issue 8 Pages 2201-2204

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Abstract

Intermolecular biradical formation between the benzophenone triplet state with cis-3-methyl-2-pentene was studied by a ns laser-photolysis technique, the fourth harmonic (266 nm) of a Q-switched Nd : YAG laser being used as an exciting light source. We succeeded for the first time in observing the transient absorption due to the 1,4-biradical in the 380–300 nm region. Its lifetime was determined to be 25±4 μs (in acetonitrile), 15±4 μs (in methanol), and 6±2 μs (in cyclohexane). Quenching experiments with methyl viologen dication were also carried out in order to assign the observed transient absorptions.

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