Abstract
Photoinduced electron-transfer processes between fullerenes (C 60) and three triphenylamines (TPA's) including bis(tolylaminophenyl) cyclohexane in the absence and presence of hexylviologen dication (HV 2+) and 1-benzyl-1,4-dihydronicotinamide (BNAH) have been studied by the transient absorption method in the visible and near-IR regions. Electron-transfer takes place initially from TPA's to the triplet states of fullerenes (3C60*), giving the radical anions of fullerenes (C60.-) and the radical cations of TPA's (TPA.+). The rate constants and efficiencies of electron transfer are quite high, because of the high electron-donor abilities of TPA's as their low oxidation potentials indicate. On addition of HV2+ to the C 60 and TPA systems, the electron-mediating process from C 60.- to HV2+ occurs, yielding the viologen radical cation (HV.+). In the further addition of BNAH, which acts as a sacrificial donor, steady-state concentration of HV.+ was accumulated during continuous photoirradiation and persisted for a long time.
Original language | English |
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Pages (from-to) | 93-100 |
Number of pages | 8 |
Journal | Journal of the Chinese Chemical Society |
Volume | 53 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2006 Feb |
Keywords
- Electron mediating
- Electron transfer
- Laser photolysis
- Triphenylamines
- [60]fullerene
ASJC Scopus subject areas
- Chemistry(all)