COG as photosensitizing electron-transfer mediator for ion-pair charge-transfer complexes between borate anions and methyl viologen dication

Toshifumi Konishi, Mamoru Fujitsuka, Osamu Ito, Yasumasa Toba, Yoshiharu Usui

研究成果査読

31 被引用数 (Scopus)

抄録

Photochemical reactions between the excited triplet state of C60 and the ion-pair charge-transfer complex which consists of electron-acceptor cation (methyl viologen (MV2)) and electron-donor anion (organo borates (~BPh3R, where R = Ph or Bu)) have been investigated by both steady-state and laser-flash photolysis. By photoirradiation of CM in the presence of MV2(-BPh3R)2 in organic solvents, the amount of MV+ increases with irradiation time, and persists for a long time even in the dark. From the laser-flash photolysis, it is found that electron transfer proceeds via 3C60 from -BPh3R in the complex, yielding ·BPh3R and C60-. Although generated Cr does not decay in the absence of MV2+ because of the rapid dissociation of BPh3R, in the presence of MV2+, C60- decays quickly by transferring an electron to MV2+ yielding MV+. Thus, it is proved that Ceo acts as a photosensitizer for pumping up an electron from -BPh3R as well as an electron mediator to MV2+. In these systems, MV+ persists even in air-saturated solution for more than an hour, suggesting that the electron transfer from MV+ to O2 is retarded.

本文言語English
ページ(範囲)9938-9942
ページ数5
ジャーナルJournal of Physical Chemistry A
103
48
DOI
出版ステータスPublished - 1999 12 2
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学

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