Photoinduced electron transfer processes of fullerene rotaxanes containing various electron-donors

作者：Sandanayaka Atula S D; Sasabe Hisahiro; Takata Toshikazu; Ito Osamu^*

来源：Journal of Photochemistry and Photobiology C: Photochemistry Reviews , 2010, 11(2-3): 73-92.

DOI：10.1016/j.jphotochemrev.2010.05.001

• Rotaxane
• Porphyrin
• Fullerene
• Electron-transfer
• Charge separation

The photosensitized electron-transfer processes in the rotaxane hybrids composed with electron-accepting fullerenes and various electron-donors placed in the rotaxanes are revealed with time-resolved fluorescence and absorption spectral methods. Porphyrins are most useful as light-harvesting donors and photosensitizing donors. In addition, aromatic amines and ferrocene act as electron-donor and also hole-shifting reagents in multi-component rotaxanes. In the rotaxanes with spatially placed donor-acceptor molecules, the role of triplet states becomes important compared with the covalently connected donor-acceptor molecular systems, which may be related to the "through-space" and "through-bond" electron transfer, respectively. In the designed multi-component rotaxanes which maintain mechanically or topologically the electron-acceptor, electron-donor, and hole-shifter, the photoinduced electron transfer, hole-shift, electron-hole recombination are established. As a whole, contribution of the triplet excited states is prominent compared with the covalently bonded molecules and supramolecular systems constructed with coordination bonds.

• 出版日期2010-9