| abstract |
The present invention provides: a mononuclear metal complex that has high catalytic activity and can be used as a hydrogenation reduction catalyst that allows efficient hydrogenation reduction of a substance to be reduced; a tautomer or stereoisomer thereof; or a salt thereof. Provided is the mononuclear metal complex represented by the following formula (1), a tautomer or stereoisomer thereof; or a salt thereof. n n n n n n n n n n In the formula (1), Ar 1 is an aromatic anionic ligand or an aromatic ligand, or is not present, Ar 2 is a ligand having aromaticity and may or may not be substituted, and when Ar 2 is substituted, the number of substituents may be one or more, M is an atom or ion of a transition metal, A 1 and A 2 are both carbon atoms, or one of A 1 and A 2 is a carbon atom and the other is a nitrogen atom, Y is an anionic group or a cationic group, or is not present, L is any ligand or is not present, and m is a positive integer, 0, or a negative integer. |