^{Construction, crystal structure, and properties of Ni(II) coordination polymer based on p-terphenyl-3, 2′, 5′, 3″-tetracarboxylate ligand}

Abstract

Using p-terphenyl-3,2′,5′,3″-tetracarboxylic acid (H₄tptc) as the main ligand, nitrogen-containing ligand phen (phen = 1, 10-phenanthroline) as auxiliary ligand, self-assembly with transition metal nickel(II) salt under hydrothermal conditions, a novel coordination polymer {[Ni₂(tptc)(phen)₂(H₂O)₆]·dioxane·2H₂O} (1) was prepared and its structure was characterized by elemental analysis, IR, powder diffraction analysis, X-ray diffraction, and so on. Structural analysis shows that 1 has a binuclear structure, which is further expanded into a 3D supramolecular network through O–H·O hydrogen bonds, and π–π stacking contributes to the further stabilization of crystal packing. The studies of photocatalytic properties show that 1 can be used as photocatalyst to achieve efficient removal of methyl orange (MB) in the aqueous phase under ultraviolet (UV) irradiation. In addition, the electrocatalytic studies showed that the OER performance of 1@NF electrode was better than RuO₂@NF and the HER performance was better than Pt/C@NF, with Tafel slopes of 12.5 mV dec⁻¹ and 37.2 mV dec⁻¹, respectively. The above results show 1 is a good multifunctional material, which can solve the problems of environmental pollution and energy shortage.

Graphical Abstract

The nickel-based coordination polymer exhibit excellent electrocatalytic and photocatalytic properties.