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Photoinduced electron transfer dynamics in porphyrin donor dyads

Paper ID Volume ID Publish Year Pages File Format Full-Text
28013 44056 2008 6 PDF Available
Title
Photoinduced electron transfer dynamics in porphyrin donor dyads
Abstract

Intramolecular photoinduced electron transfer (PET) processes occurring in dyads with a free base porphyrin-tetraazaanthracene donor (P) and either a tetracyanonaphthoquinidodimethane (TCQ) or benzoquinone (BQ) acceptor linked by a rigid six σ-bond polynorbornane bridge ([6]) have been investigated. For P[6]BQ, PET in the polar solvent benzonitrile (ɛs = 25.9) occurs with a rate constant (kPET) of 1.6 × 108 s−1 but is not evident in solvents less polar than tetrahydrofuran (ɛs = 7.52). For P[6]TCQ, highly efficient forward PET occurs in both polar and non-polar solvents (kPET > 2 × 1010 s−1). For P[6]TCQ the lifetime of the resulting charge-separated state decreases markedly with increasing solvent polarity. The results are discussed in the context of the likely mechanisms for electronic coupling and current theories for PET processes in such linked molecular systems.

Keywords
Photoinduced electron transfer; Charge-separated state lifetime; Porphyrin; Benzoquinone
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 197, Issues 2–3, 25 June 2008, Pages 220–225
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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