A copper(II) dimer: aqua(mu-2,2 '-bipyrimidine-N,N ')(perchlorato)bis{[2,6-bis(2-pyridyl)pyridine-N,N ',N '']copper(II)} triperchlorate

The title compound, [Cu-2(ClO4)(C8H6N4)(C15H11N3)(2)(H2O)](ClO4)(3), consis ts Of a dinuclear copper(II) unit, the bridge being the bipyrimidine (bipym ) ligand, which contains a twofold rotation axis. The Cu atoms are six-coor dinated by five N atoms from the bipym and terpyridine (terpy) molecules, a nd by an O atom that belongs either to a water molecule or a perchlorate an ion, presenting a distorted octahedral geometry. The equatorial Cu-N distan ces range between 1.943(3) and 2.056(3) Angstrom. One apical position is oc cupied by a bipym N atom at a distance of 2.328(3) Angstrom, while the othe r apex of the octahedron is occupied alternatively by the O atom of the wat er molecule or an O atom of the perchlorate, with Cu-O distances of 2.445(1 1) and 2.721(11) Angstrom, respectively. Most of the remaining perchlorate O atoms are disordered.