Hydrothermal Synthesis, Crystal Structure and Properties of a New Copper(II) Coordination Polymer with 3-(2-Pyridiyl)-1H-1,2,4-triazole (Hpt)

A new copper(II) coordination polymer [Cu-2(C7H5N4)(2)(3-C6H5NO2) 2](n) (1) has been hydrothermally synthesized with copper hydroxide, 3-(pyridin-2-yl)-1,2,4-triazole (Hpt) and 3-pyridinecarboxylic acid (3-PCA). It crystallizes in the monoclinic space group C2/c, with a = 16.854(2), b = 7.8616(8), c = 20.630(2) angstrom, beta = 111.126(2)degrees, V = 2549.7(5) angstrom(3), D-c = 1.723 g/cm(3), Z = 8, F(000) = 1336, the final GOOF = 1.065, R = 0.0380 and wR = 0.0972. The whole molecule consisting of two copper ions are bridged by two mu(2)-eta(1):eta(0)-3-(pyridin-2-yl)-1,2,4-triazole anions. The coordination environment of Cu(1) ion is CuO2N4, giving a distorted octahedron geometry. 1 exhibits antiferromagnetic interaction, and the electron transfer of 1 is irreversible in electrode reactions and the TG analysis shows that 1 is stable below 235 degrees C.