It takes two to transfer: A synthetic CuI metalloprotein undergoes bimolecular photoinduced electron transfer in the inverted Marcus regime. The buried CuI4S4(N/O)4 cofactor (purple) has a high reorganization energy and experiences weak electronic coupling to electron acceptors (Q) in the bulk solvent. This lowers kET below the diffusion limit and allows observation of inverted Marcus behavior.
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Hong et al. (2006) studied this question.
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