Issue 2, 2003

Photoinduced electron transfer and electron-mediating systems from aromatic amines to triplet states of C60 and C70 in the presence of a viologen dication

Abstract

Photoinduced electron transfer between fullerenes (C60 and C70) and various aromatic amines (AA's) in the absence and presence of a viologen dication has been studied by the transient absorption method in the visible and near-IR regions. Electron-transfer takes place from AA's to the triplet states of fullerenes (3C60* and 3C70*) giving the anion radicals of fullerenes (C60˙ and C70˙) and the radical cations of AA's (AA˙+). The rate constants and efficiencies of electron transfer are quite high, because of the high electron-donor abilities of AA's as their low oxidation potentials indicate. The absorption bands of AA˙+ appeared also in the near-IR region indicating that the radical-cation center (hole) delocalizes over the entire region of each AA. On addition of an octylviologen dication (OV2+) to C60/C70–AA systems, the electron-mediating process from C60˙ and C70˙ to OV2+ occurs yielding the viologen radical cation (OV˙+) with longer lifetime.

Graphical abstract: Photoinduced electron transfer and electron-mediating systems from aromatic amines to triplet states of C60 and C70 in the presence of a viologen dication

Article information

Article type
Paper
Submitted
17 Sep 2002
Accepted
06 Nov 2002
First published
06 Jan 2003

Photochem. Photobiol. Sci., 2003,2, 136-141

Photoinduced electron transfer and electron-mediating systems from aromatic amines to triplet states of C60 and C70 in the presence of a viologen dication

Y. Sasaki, Y. Araki, M. Fujitsuka, O. Ito, A. Hirao and H. Nishizawa, Photochem. Photobiol. Sci., 2003, 2, 136 DOI: 10.1039/B209111A

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