The problem of providing a metal complex having excellent gas adsorption performance, gas storage performance, and gas separation performance is solved by a metal complex comprising a dicarboxylic acid compound (I) including 20 to 99 mole % of a dicarboxylic acid compound (I-1) selected from terephthalic acid derivatives having an electron-donating group in the 2nd position such as 2-methoxyterephthalic acid, 2-methylterephthalic acid, and terephthalic acid, and 80 to 1 mole % of a dicarboxylic acid compound (I-2) selected from terephthalic acid derivatives having an electron-withdrawing group in the 2nd position such as 2-nitroterephthalic acid, 2-fluoroterephthalic acid, 2-chloroterephthalic acid, 2-bromoterephthalic acid, and 2-iodoterephthalic acid; at least one kind of metal ion selected from metal ions belonging to Group 2 and Groups 7 to 12 of the periodic table; and an organic ligand capable of bidentate binding to the metal ion.
提供一种具有优异气体吸附性能、气体储存性能和气体分离性能的
金属络合物的问题是通过一种
金属络合物来解决的,该
金属络合物包括二
羧酸化合物(I),其中包括 20 至 99 摩尔%的二
羧酸化合物(I-1),该二
羧酸化合物选自在第 2 位具有电子供基的
对苯二甲酸衍
生物,如
2-甲氧基对苯二甲酸、80-1摩尔%的二
羧酸化合物(I-2),该化合物选自在第 2 位上具有取电子基团的
对苯二甲酸衍
生物,如
2-硝基对苯二甲酸、
2-氟对苯二甲酸、
2-氯对苯二甲酸、2-
溴对苯二甲酸和
2-碘对苯二甲酸;至少一种
金属离子,选自元素周期表中第 2 族和第 7 至 12 族的
金属离子;以及一种有机
配体,能与
金属离子双齿结合。