STRUCTURE OF BIS[MU-4-AMINO-3,5-BIS(AMINOMETHYL)-1,2,4-TRIAZOLE-N',N1,N2,N']-BIS[DIAQUACOPPER(II)] BIS(SULFATE) TETRAHYDRATE

[CU(C4H10N6)(H2O)2]2(SO4)2.4H2O, M(r) = 747.6, monoclinic, C2/c, a = 19.009 (8), b = 11.273 (4), c = 13.144 (7) angstrom, beta = 103.50 (4)-degrees, Z = 4 (dinuclear units), D(x) = 1.81 g cm-3, lambda = 0.71073 angstrom, mu = 17.88 cm-1, F(000) = 1544, T = 293 K, final R =0.0583, wR = 0.0619 for 1019 reflections [I > 2sigma(I)]. The title compound represents the first doubly N1,N2 triazole-bridged copper(II) compound in which the anion is not involved in coordination. The symmetry-dependent copper(II) ions are in a distorted octahedral environment, with four N-donor atoms of the triazole ligand in the equatorial positions of which the Cu-N(triazole) distances [1.954 (9) and 1.96 (1) angstrom] are shorter than the Cu-N(amino) distances [2.04 (1) and 2.052 (9) angstrom). Two water molecules are coordinated axially at 2.60 (1) and 2.63 (1) angstrom. The sulfate anions are not coordinated and are fixed in the lattice by an extended hydrogen-bonding network with the amino group of the triazole and the water molecules.