A 3D Mesomeric Supramolecular Structure of a Cu(Ⅱ) Coordination Polymer with 1,1'-Biphenyl-2,2',3,3'-tetracarboxylic Acid and 5,5'-Dimethyl-2,2'-bipyridine Ligands

摘要

A novel metal-organic framework. {[Cu(H_2 bptc)(cbpy)(H_2O)](H_2O)}_n (1) has been hydrothermally synthesized through reaction of 1,1'-biphenyl-2,2',3,3'-tet-racarboxylic acid (H_4bptc) with Cu(Ⅱ) salt in the presence of ancillary nitrogen ligand 5,5'-dimethyl-2,2'-bipyridine (cbpy), and its structure was determined by X-ray diffraction and characterized by elemental analysis, and IR spectrum. The title compound crystallizes in monoclinic space group P2_1/c. Both right- and left-handed helices are detected in the structure. In the ab-plane, adjacent chains are homochiral and parallel to each other, which are connected together by hydrogen bonds to form a 2D supramolecular structure. The supramolecular layers with opposite chirality are arranged alternatively along the c-axis to form a 3D mesomeric supramolecular structure through π…π interactions. The thermal stability of the complex 1 was studied by thermal gravimetric and differential thermal analysis.