It is the dawning of the age of supramolecular photocatalysts for H2 production using first-row transition-metal catalytic centers. These catalysts consist of a ruthenium tris(diimine) light-harvesting unit covalently linked to various catalytic cobaloxime centers (see picture). The catalyst stability, CoII/CoI redox potential, and nucleophilicity of the cobaloxime moiety all affect the photocatalytic properties.
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Fihri et al. (2007) studied this question.
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