STRUCTURE OF AQUABIS(2,2'-BIPYRIMIDINE-N,N')COPPER(II) PERCHLORATE DIHYDRATE

[Cu(C3H6N4)2(H2O)](ClO4)2.2H2O, M(r) = 632.86, monoclinic, C2/c, a = 18.232 (3), b = 7.613 (1), c = 16.842 (4) angstrom, beta = 96.27 (2)-degrees, V = 2323.6 (8) angstrom 3, Z = 4, D(x) = 1.82 g cm3, Zr-filtered Mo K-alpha, lambda = 0.71073 angstrom, mu = 12.54 cm-1, F(000) = 1284, T = 294 (1) K, R = 0.037 for 1211 observed reflections. The title compound represents one of the first examples of a five-coordinate bis(bipyrimidine)-copper(II) complex. The cation is situated about a crystallographic twofold rotation axis which is coincident with the Cu-O bond. The coordination geometry about the metal center is approximately trigonal bipyramidal. Strong hydrogen bonding links the two water molecules of hydration to the coordinated aqua ligand; no other significant interactions were observed.