Photoinduced charge separation and stabilization in clusters of a fullerene-aniline dyad

Thomas, George K. ; Biju, V. ; Guldi, D. M. ; Kamat, Prashant V. ; George, M. V. (1999) Photoinduced charge separation and stabilization in clusters of a fullerene-aniline dyad Journal of Physical Chemistry B, 103 (42). pp. 8864-8869. ISSN 1089-5647

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Fullerene-bridge-aniline dyad and the model fulleropyrrolidine compound form stable, optically transparent clusters in mixtures (3:1) of acetonitrile and toluene. Ground- and excited-state properties of the clusters of the dyad and the model compound are compared with their corresponding monomeric forms. Clustering of the dyad as well as the model compound exhibits a red-shifted emission maximum (λmax 738 nm) compared to their monomeric forms (λmax 714 nm). The electron transfer from the appended electron donor moiety to the parent fullerene core in the dyad cluster is evident from the decreased (~80%) fluorescence yield. The formation of fullerene radical anion (absorption maximum at 1010 nm) with a lifetime of several hundreds of microseconds was further confirmed using nanosecond laser (337 nm) flash photolysis experiments. In contrast, the dyad molecules in their monomeric form did not yield any detectable yield of C60 radical anion following laser pulse excitation. The failure to observe any charge-transfer intermediates following laser pulse excitation, even in polar solvents such as benzonitrile or nitromethane, suggested that fast back-electron-transfer process must be operative in the monomeric dyad system. On the other hand, clustering of the fullerene-based dyads in a mixed-solvent system can provide a unique way to decrease the rate of back electron transfer, thus stabilizing the electron-transfer products.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:12510
Deposited On:13 Nov 2010 13:26
Last Modified:31 May 2011 10:32

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