Persistent C60 anion-radical formation via photoinduced electron transfer from tetraphenylborate and triphenylbutylborate

Toshifumi Konishi, Yoshiko Sasaki, Mamoru Fujitsuka, Yasumasa Toba, Hiroshi Moriyama, Osamu Ito

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Photochemical reactions between photo-excited C60 and borates (-BPh4 and -BPh3Bu) have been investigated by steady-state photolysis and laser flash photolysis. On steady-state photolysis of C60 in the presence of the borates in polar solvents, the absorption OfC60-• increases with irradiation time, suggesting that irreversible photoinduced electron-transfer occurs. By the measurements of the transient absorption spectra, it is indicated that electron transfer takes place from the borate anions to 3C60*, yielding C60-• and BPh3R (R = Ph or Bu), in which the latter dissociates into Ph3B and R, yielding biphenyl (or octane). Electron-donor ability of -BPh3 Bu is higher than that of -BPh4, while the steady-state photolysis to a C60/borate system shows an opposite tendency. The addition reaction of C60-• with Bu yielding BuC60- is more efficient than that with Ph producing PhC60-. The rate constant of electron-transfer via the triplet state of C60 increases with solvent polarity.

Original languageEnglish
Pages (from-to)551-556
Number of pages6
JournalJournal of the Chemical Society. Perkin Transactions 2
Issue number3
Publication statusPublished - 1999 Mar
Externally publishedYes

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Tetraphenylborate
Borates
Photolysis
Anions
Electrons
Addition reactions
Photochemical reactions
Absorption spectra
Rate constants
Irradiation
Lasers

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Persistent C60 anion-radical formation via photoinduced electron transfer from tetraphenylborate and triphenylbutylborate. / Konishi, Toshifumi; Sasaki, Yoshiko; Fujitsuka, Mamoru; Toba, Yasumasa; Moriyama, Hiroshi; Ito, Osamu.

In: Journal of the Chemical Society. Perkin Transactions 2, No. 3, 03.1999, p. 551-556.

Research output: Contribution to journalArticle

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AU - Konishi, Toshifumi

AU - Sasaki, Yoshiko

AU - Fujitsuka, Mamoru

AU - Toba, Yasumasa

AU - Moriyama, Hiroshi

AU - Ito, Osamu

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AB - Photochemical reactions between photo-excited C60 and borates (-BPh4 and -BPh3Bu) have been investigated by steady-state photolysis and laser flash photolysis. On steady-state photolysis of C60 in the presence of the borates in polar solvents, the absorption OfC60-• increases with irradiation time, suggesting that irreversible photoinduced electron-transfer occurs. By the measurements of the transient absorption spectra, it is indicated that electron transfer takes place from the borate anions to 3C60*, yielding C60-• and •BPh3R (R = Ph or Bu), in which the latter dissociates into Ph3B and R•, yielding biphenyl (or octane). Electron-donor ability of -BPh3 Bu is higher than that of -BPh4, while the steady-state photolysis to a C60/borate system shows an opposite tendency. The addition reaction of C60-• with Bu• yielding BuC60- is more efficient than that with Ph• producing PhC60-. The rate constant of electron-transfer via the triplet state of C60 increases with solvent polarity.

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