CIS-TRANS isomerization of styrenes via the triplet pathway:The perpendicular triplet state observed by laser flash photolysis |
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| Affiliation: | 1. Physics Department, Faculty of Science, Damietta University, Damietta 34517, Egypt;2. Chemistry Department, Faculty of Science, Damietta University, Damietta 34517, Egypt;1. Department of Applied Chemistry, College of Science, Northeast Agricultural University, Harbin 150030, PR China;2. College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, PR China;3. School of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China |
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| Abstract: | The kinetics of the cis-trans photoisomerization of 1-phenylcyclohexene via the triplet state, studied by either nanosecond pulse radiolysis or laser flash photolysis in the presence of sensitizers, reveal that the triplet species involved in the isomerization mechanism has a lifetime of 55 ns in fluid solution at room temperature. A transient absorption decaying with the same 55 ns lifetime, and therefore assigned to this triplet species, was abserved in the 320–345 nm region. Quite similar triplet-triplet absorptions were observed with 1-phenylcycloheptene, 1-phenylpropene and styrene itself From the experimental results and from considerations of the energy surfaces of the excited states of styrene, the observed triplet species is identified as the perpendicular (or “phantom”) triplet state of the styrene moiety. |
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