Metal-induced different structures and properties of two coordination polymers based on a Semi-flexible carboxylic ligand

Pictogram: Two 3D coordination polymers (Cu/Ni-based) have been solvothermal synthesized and characterized. In addition, their magnetic properties, electrochemical properties and gas adsorption properties were also studied. [Display omitted] •Two 3D coordination polymers (Cu/Ni-based) have been solvothermally synthesized and characterized.•The magnetic research showed that there are antiferromagnetic and ferromagnetic interactions between adjacent metal ions of 1 and 2, respectively.•In addition, CP 1 showed good electrochemical and gas adsorption properties. Two coordination polymers (CPs), namely, {[Cu2L(H2O)3.5]·1·.5H2O}n (1) and {[Ni2L(H2O)5]·H2O}n (2) have been synthesized from the ligand of 3, 3′, 5, 5′-diphenyl ether tetracarboxylic acid(C16H10O9, H4L) and metal salts. CPs 1 and 2 were characterized by single crystal X-ray diffraction, infrared (IR) spectra, elemental analysis, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analysis. Structure analysis indicates that both the compounds are composed of binuclear clusters linked by L4- ligands, forming 3D framework with {4. 64. 8}2 {42. 62. 82} and {66} topology, respectively. The temperature dependence of the magnetic susceptibility of 1 reveals antiferromagnetic exchange between adjacent Cu(II) ions. In contrast, the magnetic behavior of 2 indicates that there is mainly strong ferromagnetic coupling between the two Ni(II) ions. In addition, due to the open metal site of Cu(II) ion in 1, it showed good electrochemical performance. Furthermore, the adsorption properties of N2, CO2 and CH4 for 1 were studied. The results showed that the average heat of CO2 adsorption is 11.41 kJ·mol−1 and the average selectivity coefficient of CO2/CH4 (1:9, v/v) is 32.85 under 298 K and 1 bar.