Synthesis, crystal structures and properties of four topological structures based on 2,3,5,6-tetramethyl-1,4-benzenedicarboxylate acid and bipyridine ligands

Abstract

Five coordination polymers with four different typological structures have been obtained based on 2,3,5,6-tetramethyl-1,4-benzenedicarboxylate acid (H₂TBDC) and bipyridine ligands: 1D zigzag chain Cd(2,2′-bpy)(TBDC)(H₂O)·H₂O (1), 2D grid with (4,4)-net Co(H₂O)₂(4,4′-bpy)(TBDC)·2H₂O (2), 3D interpenetrating frameworks with diamond topology Ni(4,4′-bpy)(TBDC) (3) and Cu(4,4′-bpy)(TBDC) (4), 3D porous framework with pcu network Co₂(4,4′-bpy)(TBDC)₂·2H₂O·5DMF (5). Especially, complexes 2 and 5 with different topologies were obtained by use of the same reactant but change of the solvents. The gas sorption of complex 5 has also been studied.