Patent ID: 8592626

Claim:
A metal complex comprising: an aromatic dihydroxy monocarboxylic acid compound; at least one metal selected from the group consisting of chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, copper, zinc, and cadmium; and an organic ligand capable of bidentate binding to the metal; wherein the aromatic dihydroxy monocarboxylic acid compound is: a compound represented by the following formula (I): where R 1 , R 2 , R 3 , R 4 and R 5 may be the same or different and each independently represents a hydrogen atom, an alkyl group which may have a substituent, an aryl group, an aralkyl group, an alkoxy group, an aryloxy group, an aralkyloxy group, an amino group, an amide group, or a halogen atom; or a compound represented by the following formula (II): where R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 may be the same or different and each independently represents a hydrogen atom, an alkyl group which may have a substituent, an aryl group, an aralkyl group, an alkoxy group, an aryloxy group, an aralkyloxy group, an amino group, an amide group, or a halogen atom.