| abstract |
To provide a metal complex having excellent gas separation performance. 1 to 30 mol% of a dicarboxylic acid compound (I-1) selected from isophthalic acid derivatives optionally having an electron donating group at the 5-position such as 5-methoxyisophthalic acid and isophthalic acid; An isophthalic acid derivative having an electron-withdrawing group at the 5-position, such as nitroisophthalic acid, 5-formylisophthalic acid, 5-fluoroisophthalic acid, 5-chloroisophthalic acid, 5-bromoisophthalic acid, 5-iodoisophthalic acid, or 3, Dicarboxylic acid compound (I) composed of 99 to 70 mol% of a dicarboxylic acid compound (I-2) selected from 5-pyridinedicarboxylic acid derivatives; metals belonging to groups 4 to 6 of groups 6 to 12 of the periodic table, magnesium, and A metal complex comprising: at least one metal selected from aluminum; and an organic ligand capable of bidentate coordination with the metal. [Selection] Figure 2 |