Photoinduced electron transfer in hydrogen bonded donor-acceptor systems. Study of the dependence of rate on free energy and simultaneous observation of the Marcus and Rehm-Weller behaviors

Prasad, E. ; Gopidas, K. R. (2000) Photoinduced electron transfer in hydrogen bonded donor-acceptor systems. Study of the dependence of rate on free energy and simultaneous observation of the Marcus and Rehm-Weller behaviors Journal of the American Chemical Society, 122 (13). pp. 3191-3196. ISSN 0002-7863

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ja993872d

Related URL: http://dx.doi.org/10.1021/ja993872d

Abstract

Hydrogen bonding networks play a very important role in biological electron-transfer processes. The free energy dependence of electron transfer in a few small-molecule donor-acceptor systems, having hydrogen bonding appendages, were studied by fluorescence lifetime quenching measurements. Two types of electron transfers take place in these systems. A fraction of the molecules associates and exists as hydrogen bonded species and electron transfer in this segment is unimolecular. A major fraction of the donors and acceptors freely diffuse in the medium and electron transfer is bimolecular in this segment. Free energy dependence studies showed that the former obeys the Marcus equation and the latter follows the Rehm-Weller behavior. The absence of the inverted region in bimolecular charge separation reactions is thus attributed to diffusion in the moderately large driving force regime.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:62091
Deposited On:16 Sep 2011 04:36
Last Modified:16 Sep 2011 04:36

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