Optical studies on the lowest triplet state of chromone.
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概要
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The lowest excited triplet state of chromone was investigated <I>via</I> high resolution phosphorescence spectra, phosphorescence excitation spectra and triplet lifetimes in the neat crystal, in the single crystals of durene and benzoic acid at liquid helium temperature. Including the cases in other solvents such as 3-methylpentane, methylcyclohexane and ethanol, the lowest triplet state was assigned to be ππ<SUP>*</SUP> type contrary to the previous assignment. The triplet sublevel properties including the sublevel spectra were obtained in the benzoic acid host. T<SUB>y</SUB> is radiative at the 0-0 band. T<SUB>z</SUB> is radiative at the non to tally symmetric bands and is active in nonradiative transitions. These properties are discussed and compared with those of other carbonyl compounds. A brief comment on the photochemical reactions are given.
著者
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Hirota Noboru
Department Of Chemistry Faculty Of Science Kyoto University
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Yamada Yasuko
Department of Chemistry, Faculty of Science, Kyoto University
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Yamauchi Seigo
Department of Chemistry, Faculty of Science, Kyoto University
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