Intersystem Crossing of Radical Pair in Solvent Cage. External Heavy Atom Effect on Dual Photoreactions of Phthalazine.

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概要

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• The effects of the temperature, initial concentration, and chemical quenchers on dual photoreactions of phthalazine were investigated. The results give further supporting evidence for a previously proposed reaction mechanism, i.e., phthalazine in the lowest excited singlet and triplet states affords singlet and triplet radical pairs, respectively, in the initial hydrogen abstraction process from 2-propanol. The singlet radical pair gives a reduction product in a solvent cage, whereas the radicals produced in the triplet state escape from the solvent cage, causing dimerization. On the basis of the reaction mechanism of dual photoreactions, external heavy-atom effects on the radical pairs within a solvent cage have been studied. The results indicate that heavy-atom perturbations bring about an enhancement of the intersystem crossing efficiency from the triplet-state radical pair to the singlet one, including a spin inversion of the radical pair in the solvent cage, rather than S<SUB>1</SUB>→T<SUB>1</SUB> intersystem crossing induced within a single molecule of phthalazine.

• 公益社団法人 日本化学会の論文

著者

• Okubo Jun

  Department Of Chemistry College Of Science And Engineering Aoyama Gakuin University

• Sakurai Tadamitsu

  Department Of Applied Chemistry Faculty Of Engineering Kanagawa University

• Inoue Hiroyasu

  Department Of Applied Chemistry Faculty Of Technology Kanagawa University

• Ono Isao

  Department Of Chemistry College Of Science And Engineering Aoyama Gakuin University

• HOSHI Toshihiko

  Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University

• Okubo Jun

  Department of Natural Science for General Education, Tokyo Denki University

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