Tuning topological and dimensional versatility from 1D to 3D of Zn/Cd luminescent biphenyl-3,5-dicarboxylate coordination polymers by ancillary ligand

The present study reports application of biphenyl-3,5-dicarboxylic acid (H2L) as a versatile building block for synthesis of d10 metal coordination polymers (CPs). Five Cd(II) and Zn(II)-containing CPs based on N, N-donor ancillary ligands, [Cd2(mu 3-L)2(mu 2-4,4'-tmbpy)(MeOH)]8 (1), [Cd(mu 2-L)(2,2'-bpy) (H2O)]8 mu n(MeOH) (2), [Cd(mu 2-L)(dipt)]8 (3), [Cd(mu 3-L)(phen)]8 mu nH2O (4), and [Zn(mu 2-L)(mu 2-4,4'-tmbpy)]8 mu nH2O (5) {4,4'-tmbpy = 4,4'-trimethylenedipyridine, 2,2'-bpy = 2,2'-bipyridine, dipt = 2,9-dimethyl-1,10-phenanthroline, phen = 1,10-phenanthroline} have been prepared under solvothermal conditions. 1-5 have been characterized by single crystal X-ray diffraction, elemental analysis, infrared (IR) spectra, and powder X-ray diffraction (PXRD). Complex 1 exhibits a three-dimensional (3-D) framework with a rare fsc3,4- I41/ amd topology. Complexes 2-4 show one-dimensional (1-D) structures. Complex 5 features a two-dimensional (2-D) layer structure with a sql topology. The structural and topological diversity of 1-5 are mainly attributed to the effect of the N, N-donor ancillary ligand. Solid-state luminescent properties and thermal stabilities of the obtained products have been investigated.