Structure and Optical Properties of Plane-Type And Z-Type Topology Triazole Quinoxaline Cd(II) Complexes

Abstract

Two coordination polymers are obtained by self-assembly reactions of Cd²⁺ with 2,3-bis((1H-1,2,4-triazol-1-yl)methyl)quinoxaline (BTMQ) and terephthalic acid at room temperature. Complex 1 exhibits a two-dimensional planar structure, which crystallizes in the monoclinic space group P2₁/c with unit cell parameters: a = 12.752(4) Å, b = 9.416(3) Å, c = 16.069(5) Å, α = 90, β = 102.146(5), γ = 90°, V = 1886.4(10) ų, Z = 2. Complex 2 shows a Z-type two-dimensional network structure, and crystallizes in the triclinic space group P-1 with unit cell parameters: a = 6.917(4) Å, b = 10.338(5) Å, c = 16.156(8) Å, α = 96.889(7), β = 93.421(8), γ = 96.161(7)°, V = 1137.2(10) ų, Z = 1. Fluorescence spectral studies of BTMQ and the two complexes are also investigated, and the results show that the fluorescence intensity of complex 1 is stronger than that of the ligand, but the fluorescence intensity of complex 2 is weaker than that of the ligand.