| abstract |
PROBLEM TO BE SOLVED: To provide a metal complex having excellent gas separation performance. The following general formula (I): Wherein R 1 , R 2 and R 3 are the same or different and each represents a hydrogen atom, an alkyl group which may have a substituent or a halogen atom, and X represents an electron donating property by a resonance effect. A dicarboxylic acid compound (I) represented by the following formula: and at least one metal selected from chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, copper and zinc And the metal complex comprising an organic ligand capable of bidentate coordination with the metal solves the above-mentioned problem. [Selection figure] None |