Synthesis and structure of binuclear cage-like rare earth complex [Eu2 (TCM)2(DMSO)6] • 2DMSO

A new binuclear cage-like complex, [ Eu-2 (TCM) (2) (DMSO) 6] center dot 2DMSO, was synthesized via the reaction of H3TCM ( H3TCM = {2, 4, 6-tris [ ( 2-carboxyphenoxy) methyl ]-1, 3, 5-trimethylbenzene} ) and Eu3+. Single crystal X-ray diffraction study reveals a centro symmetric binuclear neutral entity, space group P2(1)/c with a = 1. 5188 (2) nm, b = 1. 7135 (3) nm, c = 1. 7578 (2) nm, beta = 95. 34 (2) degrees, V = 4. 5549 (9) nm 3, Z = 4. In the complex, Eu3+ metal centers are bridged together by mono- and bidentate carboxylate groups from two ligands. The most interesting fact is that the size of solvent molecules has a great influence on the binuclear cage-like complex in the shape of binuclear cage, the coordination mode of carboxylate group and the coordination number of Eu3+.