A time-resolved electron paramagnetic resonance study on the photoinduced electron transfer reactions from metalloporphyrins to quinones

Seigo Yamauchi, Toru Ueda, Minoru Satoh, Kimio Akiyama, Shozo Tero-Kubota, Yusaku Ikegami, Masamoto Iwaizumi

研究成果: Article査読

15 被引用数 (Scopus)

抄録

The photoinduced electron transfer reactions in the systems of zinc tetraphenylporphyrin (ZnTPP) and magnesium tetraphenylporphines (MgTPPs) and 1,4-benzoquinone were investigated by means of a time-resolved electron paramagnetic resonance (EPR) technique and deuteration of the compounds. Three kinds of reaction intermediate - the porphyrin cation, the quinone anion and their ion pair - were definitely assigned by reference to their EPR parameters. From simultaneous observations of the separated ions (SIs) and the ion pair, it is established that the rates from a contact ion pair to a solvent separated ion pair (SSIP) and from an SSIP to an SI are accelerated by axial ligation and addition of the salt respectively. The magnitudes of these effects were different for the ZnTPP and MgTPP systems, and their origins are briefly discussed.

本文言語English
ページ(範囲)177-182
ページ数6
ジャーナルJournal of Photochemistry and Photobiology, A: Chemistry
65
1-2
DOI
出版ステータスPublished - 1992 4 30

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 物理学および天文学(全般)

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