Competition between triplet energy transfer and electron transfer of photoexcited C60 in the presence of β-carotene by changing solvent polarity

Yoshiko Sasaki, Mamoru Fujitsuka, Akira Watanabe, Osamu Ito

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22 Citations (Scopus)

Abstract

The electron transfer and triplet energy transfer from β-carotene to photo-excited C60 in polar and nonpolar solvents have been investigated by 532 nm laser flash photolysis with observation of the transient absorption bands in the visible and near-IR regions. The transient absorption band of the triplet state of C60, which appeared immediately after nanosecond laser exposure, was effectively quenched by β-carotene. With the decay of the triplet state of C60, the intense absorption band of the cation radical of β-carotene appeared at 980 nm with a weak absorption shoulder of the anion radical of C60 at 1070 nm in addition to the triplet state of β-carotene at 550 nm. This indicates that electron transfer takes place from β-carotene to the triplet state of C60 in addition to energy transfer from the triplet state of C60 to β-carotene. In nonpolar solvents, triplet energy transfer predominantly takes place. The relative fraction of the two routes was varied by changing the solvent polarity. After electron transfer, the cation radical of β-carotene disappeared by back electron transfer.

Original languageEnglish
Pages (from-to)4275-4279
Number of pages5
JournalJournal of the Chemical Society - Faraday Transactions
Volume93
Issue number24
DOIs
Publication statusPublished - 1997 Jan 1

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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