Flexible Bis(benzimidazole)-based Ligands Directed the Structure Characteristics of Coordination Polymers Based on Diphenic Acid Co-ligands: Syntheses, Structures and Properties

Two new coordination polymers [Cu-2(bbim)(dpa)(2)(C2H5OH)(2)] (1), [Co(dpa)(2)(bbbm)](2) (H(2)dpa = diphenic acid, bbim = 1,1'-(1,6-hexanediyl)bis-1H-benzimidazole, bbbm = 1,1'-(1,4-butanediyl)bis-1H-benzimidazole) constructed from bis(benzimidazole)-based ligands with different lengths and diphenic acid co-ligand have been synthesized under solvothermal conditions. Complex 1 possesses Cu-dpa helical chains. The adjacent chains are connected by the bbim ligands into two-dimensional (2D) 3-connected (6(3)) topology. Differently, the layer structure of 2 was consisted by one-dimensional chains containing alternated 8- and 18-membered rings. Furthermore, the thermal stability and fluorescence property for all crystalline materials have been investigated.