Solar energy storage reactions involving metal complexes

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Photochemical properties of transition metal complexes are discussed as they relate to possible schemes for energy storage. Complexes of copper(I) with π-acceptor ligands have been used to sensitize isomerizations of organic molecules, and there is room for considerable further investigation in this area. Electron transfer reactions have been more intensively studied. These reactions fall into three broad categories: ionization, oxidative addition/reductive elimination, and excited state electron transfer. Experiments in the first two categories have generally led to rather poor storage efficiency and have required ultraviolet light. But long-lived excited states of coordination compounds can participate in chemical reactions with high efficiency, and such systems are promising for solar energy storage. Specific systems of this type that are discussed in detail involve electron transfer quenching of the lowest emissive excited states of Ru(2, 2‘-bipyridine)23+M2 (diisocyanoalkane)2+4(M=Rh, Ir), and Mo6cl2-14. © IUPAC

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Pure and Applied Chemistry

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