Carbon dioxide and hydrogen or formic acid used in the dehydrogenation catalyst, using the catalyst

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PROBLEM TO BE SOLVED : To provide a catalyst capable of performing production of formic acid by hydrogenation of carbon dioxide, production of hydrogen by dehydrogenation of formic acid and storage and production of hydrogen, with high efficiency and high energy efficiency.SOLUTION : There is provided a mononuclear metal complex expressed by formula (1) (Qto Qare each nitrogen or nitrogen and carbon; Xto Xare each hydroxy or the like; Rto Rare each hydrogen atom, alkyl or the like; Y is arbitrary ligand or non-existent; and m is positive integer, zero or negative integer).