Synthesis,Crystal Structure and Properties of a New Binuclear Copper(Ⅱ) Complex with 5-Oxo-4-oxa-tricyclo[4.2.1.0]nonane-9-carboxylic Acid(TNCA)

A new binuclear copper(Ⅱ) complex Cu_2(Hpt)_2(TNCA)_2(H_2O)_2]·4 H_2O(1) has been synthesized with copper acetate, 5-oxo-4-oxa-tricyclo4.2.1.0]nonane-9-carboxylic acid(TNCA) and 3-(pyridin-2-yl)-1,2,4-triazole(Hpt). It crystallizes in the triclinic space group P~-_1, with a = 8.8199(18), b = 14.278(3), c = 15.269(3) ?, α = 76.21(3)o, β = 81.07(3)o, γ = 76.07(3)o, V = 1802.7(6) ?~3, Dc = 1.636 g/cm~3, Z = 2, F(000) = 916, the final GOOF = 1.051, R = 0.0556 and wR = 0.1388. The whole molecule consists of two copper ions bridged by two μ_2-η~1:η~0-3-(pyridin-2-yl)-1,2,4-triazole anions. The coordination environment of the Cu(1) ion is CuO_2N_3, giving a distorted square pyramidal geometry. 1 exhibits antiferromagnetic interaction between Cu(Ⅱ) ions, the electron transfer of 1 is irreversible in electrode reactions and the TG analysis shows that 1 is stable below 440 K.