Issue 13, 2009

Energy transfer processes in electronically coupled porphyrin hetero-dyads connected at the β position

Abstract

Energy transfer in a series of hetero-dyads of zinc porphyrin and free-base porphyrin connected at the β position by π conjugated bridges has been determined. The dyads have been characterized and compared with the homo dyads, excellent models for the donor and the acceptor porphyrins in the electronically conjugated system. The homo dyads provide reliable parameters for the determination of the energy transfer rate calculated according to the Förster theory. This model was inadequate to account for the experimental findings and an electron exchange mechanism was shown to contribute. A favorable coplanar arrangement of the bridge and the tetrapyrroles facilitates the energy transfer process, which displays a very low distance dependence and an efficiency >98%.

Graphical abstract: Energy transfer processes in electronically coupled porphyrin hetero-dyads connected at the β position

Article information

Article type
Paper
Submitted
28 Oct 2008
Accepted
18 Dec 2008
First published
06 Feb 2009

Phys. Chem. Chem. Phys., 2009,11, 2166-2176

Energy transfer processes in electronically coupled porphyrin hetero-dyads connected at the β position

B. Ventura, F. Barigelletti, F. Lodato, D. L. Officer and L. Flamigni, Phys. Chem. Chem. Phys., 2009, 11, 2166 DOI: 10.1039/B819138G

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