Transient absorption in the sensitized photoisomerization of stibene.
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概要
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The sensitized photoisomerization of stilbene was studied with nanosecond time-resolved absorption spectroscopy at room temperature. In non-viscous solvents (heptane, benzene, and ethanol), the transient spectrum does not depend upon a starting material being either <I>cis</I>- or <I>trans</I>-stilbene. The kinetic analysis of the transient spectrum due to stilbene shows that the observed spectrum consists of the T<I><SUB>n</SUB></I>-T<SUB>1</SUB> absorption spectrum of <I>trans</I>-stilbene and that of twisted triplet (phantom triplet) stilbene. The lifetime of the twisted triplet stilbene is determined to be approximately 120 ns. In a viscous solvent (<I>t</I>-butyl alcohol), the transient behavior of triplet stilbene is dependent upon the starting materials being either <I>cis</I>- or <I>trans</I>-stilbene. The contribution of the twisted triplet stilbene to the transient spectrum is larger for the case starting from <I>cis</I>-stilbene than for the case starting from <I>trans</I>-stilbene.
- 公益社団法人 日本化学会の論文
著者
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NAGAKURA Saburo
Institute for Molecular Science
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YOSHIHARA Keitaro
Institute for Molecular Science
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Sumitani Minoru
Institute for Molecular Science
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