Abstract
A model of influence of non-heme Fe2+ ion on kinetics of electron transfer between quinone anion-radicals Q A − and Q B − in bacterial reaction centres is proposed and investigated. Physical mechanism of the influence is associated with singlet-triplet transitions in Q A − Q B − Pair caused by interactions with paramagnetic Fe2+. The model incorporates exchange couplings between the particles and zero-field splittings in high-spin Fe2+. These interactions are shown to catalyze electron transfer in triplet pairs and alter the reaction yield significantly.
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