Abstract: A catalyst including, as effective ingredient, complex represented by Formula (1) which contains bidentate ligand including aromatic heterocyclic 5-membered ring having 2 or more nitrogen atoms, or represented by Formula (2) which contains bidentate ligand including: aromatic heterocyclic 5-membered ring having 2 or more nitrogen atoms; and 6-membered ring having 1 or more nitrogen atoms, isomer or salt of the complex: where M1 and M2 denote transition metal such as iridium; X1 to X16 each independently denote nitrogen or carbon; R1 to R13 denote, for example, hydrogen atom, alkyl group, or hydroxy group, provided that when Xi (where i denotes 13 to 16) is nitrogen, Ri is absent at position corresponding to the nitrogen; L1 and L2 denote, for example, an aromatic anionic ligand; Z1 and Z2 denote any ligand or are absent; and m and n denote positive integer, 0, or negative integer.

Abstract: A catalyst including, as effective ingredient, complex represented by Formula (1) which contains bidentate ligand including aromatic heterocyclic 5-membered ring having 2 or more nitrogen atoms, or represented by Formula (2) which contains bidentate ligand including: aromatic heterocyclic 5-membered ring having 2 or more nitrogen atoms; and 6-membered ring having 1 or more nitrogen atoms, isomer or salt of the complex: where M1 and M2 denote transition metal such as iridium; X1 to X16 each independently denote nitrogen or carbon; R1 to R13 denote, for example, hydrogen atom, alkyl group, or hydroxy group, provided that when Xi (where i denotes 13 to 16) is nitrogen, R1 is absent at position corresponding to the nitrogen; L1 and L2 denote, for example, an aromatic anionic ligand; Z1 and Z2 denote any ligand or are absent; and m and n denote positive integer, 0, or negative integer.

Abstract: To provide a catalyst for dehydrogenation of formic acid which allows hydrogen, heavy hydrogen gas or heavy-hydrogenated hydrogen containing no carbon monoxide to be produced through dehydrogenation of formic acid in a highly efficient manner. A catalyst for dehydrogenation of formic acid, including: a multinuclear metal complex represented by the following Formula (1), a tautomer or stereoisomer thereof, or a salt thereof, where M1 and M2 denote transition metals and may be the same as or different from each other; Q1 to Q6 each independently denote carbon or nitrogen; R1 to R6 each independently denote, for example, a hydrogen atom, an alkyl group, a phenyl group, a nitro group, a halogen group, a sulfonate group (sulfo group); L1 and L2 each independently denote an aromatic anionic ligand or an aromatic ligand, and may be substituted by one or more substituents; Y1 and Y2 each independently denote any ligand or are absent; and m denotes a positive integer, 0, or a negative integer.

Abstract: To provide a catalyst for dehydrogenation of formic acid which allows hydrogen, heavy hydrogen gas or heavy-hydrogenated hydrogen containing no carbon monoxide to be produced through dehydrogenation of formic acid in a highly efficient manner. A catalyst for dehydrogenation of formic acid, including: a multinuclear metal complex represented by the following Formula (1), a tautomer or stereoisomer thereof, or a salt thereof, where M1 and M2 denote transition metals and may be the same as or different from each other; Q1 to Q6 each independently denote carbon or nitrogen; R1 to R6 each independently denote, for example, a hydrogen atom, an alkyl group, a phenyl group, a nitro group, a halogen group, a sulfonate group (sulfo group); L1 and L2 each independently denote an aromatic anionic ligand or an aromatic ligand, and may be substituted by one or more substituents; Y1 and Y2 each independently denote any ligand or are absent; and m denotes a positive integer, 0, or a negative integer.