Synthesis, crystal structure, and properties of a zn(II) coordination polymer based on a difunctional ligand containing triazolyl and carboxyl groups

Abstract

A new compound, namely, [Zn(L)2 ]n (1) was obtained by the reaction of 2-methyl-4-(4H-1,2, 4-triazol-4-yl) benzoic acid (HL) with ZnSO4·7H2 O, and the compound was characterized by single-crystal X-ray diffraction, infrared spectroscopy, elemental analysis, powder X-ray diffraction (PXRD), and thermogravimetric analysis. The linear HL ligands were deprotonated to be L− anions and act as two-connectors to link Zn2+ to form a two-dimensional (2D) lay structure with (4, 4) topology. The large vacancy of 2D framework allows another layer structure to interpenetrate, resulting in the formation of 2D + 2D → 2D parallel interpenetration in 1. The weak interactions, such as hydrogen bonding and π–π stacking interactions, connect the adjacent 2D layers into a three-dimensional (3D) coordination polymer. The solid-state UV-visible spectroscopy and luminescent property have also been studied.