A new binuclear copper(II) complex [Cu_2(Hpt)_2(TNCA)_2(H_2O)_2]·4H_2O (1) has been synthesized with copper acetate, 5-oxo-4-oxa-tricyclo[4.2.1.0]nonane-9-carboxylic acid (TNCA) and 3-(pyridin-2-yl)-1,2,4-triazole (Hpt). It crystallizes in the triclinic space group P1, with a = 8.8199(18), b = 14.278(3), c = 15.269(3) A, α = 76.21(3)º, β = 81.07(3)º, γ = 76.07(3)º, V = 1802.7(6) A~3, D_c = 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...