Patent ID: 8519131

Claim:
A modified metal complex obtained by the step of subjecting a metal complex comprising an organic compound having two to six phenol rings and three to eight nitrogen-containing aromatic heterocycles in its molecule as a ligand to any one treatment of a heating treatment, a radiation irradiation treatment and a discharge treatment until a mass reduction rate after the treatment becomes 1 mass % or more and 90 mass % or less, thereby the complex shows a carbon content after the treatment of 5 mass % or more, wherein the nitrogen-containing aromatic heterocycles are selected from the group consisting of pyridine, pyrazine, pyridazine, pyrimidine, pyrrole, triazole, pyrazole, thiazole, oxazole, imidazole, indole, benzoimidazole, phenanthroline, carbazole, quinoline, isoquinoline, cinnoline, phthalazine, quinazoline, quinoxaline and benzodiazine, and wherein the metal complex comprises metal atom(s) selected from the group consisting of scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, yttrium, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum and gold.