Resource Recycling of Carbon Dioxide with Catalysis by Heteromultinuclear Metal Complexes

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We developed methods and new materials for use in electrochemical and photochemical reduction of carbon dioxide. The following progress was made:- We built a new instrument for automatic analysis of products from electrochemical reduction catalyzed by metal complexes. It performs simultaneous sampling of gas and liquid phases and analysis without manual processing.- We proposed a new concept, "binary ligands," that enables rational design and synthesis of first-row transition metal complexes. These complexes are stable under repetitive redox cycles and thus suitable for electrochemical reduction. We also succeeded in photochemical reactions and synthesis of multinuclear metal complexes by use of these ligands.- We developed new photochemical systems by use of quinone/hydroquinone redox systems. These systems are useful for capture and chemical reduction of carbon dioxide.