SYNTHESES, STRUCTURAL INSIGHT AND HIRSHFELD SURFACE ANALYSIS OF TWO HETEROLEPTIC COORDINATION POLYMER OF Cu(II)

Using a solvothermal method, we have synthesized two coordination polymers of Cu(II). One is a 1D polymer {[Cu(bpy)(NDC)(H2O)]center dot 2H(2)O}(n) (1, 1D) formed with 1,8-naphthalene dicarboxylic acid (H2NDC) and 2,2'-bipyridine (bpy) as an auxiliary ligand, while the other is a 2D polymer {[Cu-3(TMA) (Imd)(3)]center dot 5H(2)O center dot 2DMF}n (2, 2D) formed with trimellitic acid (H(3)TMA) and imidazole (Imd) as an auxiliary ligand. Both coordination polymers 1 and 2 were formed through an in situ hydrolytic ring opening reaction of 1,8-naphthalic anhydride and trimelitic anhydride with bipyridine and imidazole ligands, respectively. The asymmetric unit of polymer 1 contains asymmetric eta(1) binding mode (one of the carboxylate) linking distorted square-pyramidal [Cu(NDC)(bpy)(H2O)](2+) coordination units. The syn-syn-eta(1):eta(1) linear polymeric conformation exist in the 1D coordination polymer with adjacent Cu...Cu distance is 6.849 angstrom. A chain of cyclic tetrameric water clusters is present between the stacked layers of the 3D supramolecular structure. The formation of the 3D supramolecular structure is guided by various weak interactions such as O-HO, C-H...O, C-H...pi and pi...pi interactions. The coordination polymer 2 forms 3D supramolecular architecture guided by various weak interactions such as O-H...O, C-H...O and N-H...O interactions. The crystal structures of both coordination polymers have been determined using single crystal X-ray diffraction and their structural features are described.