| abstract |
A metal complex having excellent gas separation performance is provided. A dicarboxylic acid compound, such as an isophthalic acid derivative, a 2,7-naphthalenedicarboxylic acid derivative, and a 4,4′-benzophenine dicarboxylic acid derivative, whose carboxyl groups are 120 ° to each other in the structural formula, and chromium At least one metal selected from molybdenum, tungsten, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, copper, zinc and cadmium, and 4,4′-bipyridyl capable of bidentate coordination with the metal Metal complexes composed of organic ligands such as [Selection figure] None |