A Double Azole-bridged Dinuclear Copper(Ⅱ) Complex Containing 4-Pyridyl-NH-1,2,3-triazoles: Synthesis,Structure and Magnetism

A new dinuclear copper(Ⅱ) compound Cu_2(CH_3COO)_2(L)_2(H_2O)_2]·4H_2O(1, HL = 4-pyridyl-NH-1,2,3-triazole) has been synthesized and characterized. Single-crystal X-ray diffraction showed that complex 1 crystallizes in monoclinic space group P2_1/c with a = 0.8427(1), b = 1.0981(1), c = 1.3610(1) nm, β = 93.364(4)°, V = 1.2573(1) nm~3, M_r = 643.56, Z = 2, D_c = 1.700 g/cm~3, μ = 1.760 mm~(-1), R = 0.0376, wR = 0.0981, and possesses a planar Cu_2N_4 six-membered ring, in which both Cu(Ⅱ) ions are bridged by two 1,2,3-triazole ligands. The neighboring dinuclear molecules are bound by strong intermolecular hydrogen bonds to create 1-D chains expanding along the b axis, which further form a 3-D supramolecular framework. Magnetic susceptibility measurement indicated the presence of weak antiferromagnetic interactions within the complex. The best fit using spin Hamiltonian yields the magnetic coupling constant J = –14.82 cm~(-1) above 30 K. The magnetic data are compared to those obtained for related double diazine bridged dinuclear copper(Ⅱ) complexes and magnetostructural correlations are discussed.