Tetracarboxylate Ligands as New Chelates Supporting Copper(II) Paddlewheel-Like Structures
作者:Antoine Gomila、Sylvain Duval、Céline Besnard、Karl W. Krämer、Shi-Xia Liu、Silvio Decurtins、Alan F. Williams
DOI:10.1021/ic403077q
日期:2014.3.3
Two new ligands N,N,N′,N′-tetrakis(2-methylbenzoic acid)-1,4-diaminomethylbenzene, 5H4, and N,N,N′,N′-tetrakis(2-methylbenzoic acid)-4,4′-diaminomethyldiphenyl, 6H4, carrying four carboxylate groups suitable for bridging dinuclear centers have been prepared and their paddlewheel complexes with copper(II) prepared. The phenyl-bridged ligand 5H4 gives a cyclic octanuclear species [(Cu2)4(5)4], while
两个新的配体N,N,N ',N'-四(2-甲基苯甲酸)-1,4-二氨基甲基苯5 H 4和N,N,N ',N'-四基(2-甲基苯甲酸)-已经制备了带有四个适于桥接双核中心的羧酸酯基团的4,4′-二氨基甲基二苯基,6 H 4,并且制备了它们与铜(II)的桨轮配合物。苯基桥连的配体5 H 4给出环状八核种[(Cu 2)4(5)4],而联苯桥连的配体6 H 4给出了灯笼状的四核物种[(Cu 2)2(6)2 ];两者均通过X射线晶体学表征。如果5的胺官能团被质子化,则分子内氢键将四个羧酸盐定位为允许形成不寻常的化合物[Cu 4(5 H 2)2 Cl] 3+,其中Cu 4正方形以a为中心氯配体夹在两个(5 H 2)2–配体。已对该化合物的磁性能进行了研究,并显示出相邻铜之间的反铁磁耦合(J = -33.7 cm –1)。