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Excited state electron transfer of fullerenes. Singlet states versus triplet states

✍ Scribed by J.V. Caspar; Y. Wang

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 771 KB
Volume: 218
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)e1471-r

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✦ Synopsis

We report that the quenching rate constants of the triplet states of fullerenes ( CT0 and CsO) by aromatic amines such as N,Ndiethylaniline and N-ethylcarbazole are at least four orders of magnitude smaller than those of the singlet states in methylcyclohexane. Such dramatic differences between the singlet and triplet electron transfer rate constants from a single species, in spite of the states' apparently similar energetics, are unprecedented. Several possible mechanisms are discussed. The data can be rationalized by the presence of structural distortion and biradical character in the triplet state.

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