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Effect of orientational motion of mobile chromophores on the dynamics of Forster energy transfer in polymers

Srinivas, Goundla and Bagchi, Biman (2001) Effect of orientational motion of mobile chromophores on the dynamics of Forster energy transfer in polymers. In: Journal of Physical Chemistry B, 105 (38). pp. 9370-9374.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp0111968


Brownian dynamics (BD) simulations have been carried out to explore the effects of the orientational motion of the donor-acceptor (D-A) chromophore pair on the Forster energy transfer between the D-A pair embedded in a polymer chain in solution. It is found that the usually employed orientational averaging (that is, replacing the orientational factor, kappa, by kappa (2) = 2/3) may lead to an error in the estimation of the rate of the reaction by about 20%. In the limit of slow orientational relaxation, the preaveraging of the orientational factor leads to an overestimation of the rate, while in the opposite limit of very fast orientational relaxation, the usual scheme underestimates the rate. The latter results from an interesting interplay between reaction and diffusion. On the other hand, when one of the chromophores is fixed, the preaveraged rate is found to be fairly reliable if the rotational relaxation of the chromophore is sufficiently fast. The present study also reveals a power law dependence of the FRET rate on the chain length (rate proportional to N- alpha, with alpha approximate to 2.6).

Item Type: Journal Article
Publication: Journal of Physical Chemistry B
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 Aug 2011 06:48
Last Modified: 02 Aug 2011 06:48
URI: http://eprints.iisc.ac.in/id/eprint/39536

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