Copper(II) dimer: Aqua(μ-2,2 prime -bipyrimidine-N,N prime )(perchlorato)bis{$L B@2,6-bis(2- pyridyl)pyridine-N,N prime ,N double prime ]copper(II)} triperchlorate

The title compound, [Cu2(ClO4)(C8H6N4)(C15H11N3)$ -2$/-(H2 O)](ClO4)3, consists of a dinuclear copper(II) unit, the bridge being the bipyrimidine (bipym) ligand, which contains a twofold rotation axis. The Cu atoms are six-coordinated by five N atoms from the bipym and terpyridine (terpy) molecules, and by an O atom that belongs either to a water molecule or a perchlorate anion, presenting a distorted octahedral geometry. The equatorial Cu-N distances range between 1.943 (3) and 2.056 (3) angstroms. One apical position is occupied by a bipym N atom at a distance of 2.328 (3) angstroms, while the other apex of the octahedron is occupied alternatively by the O atom of the water molecule or an O atom of the perchlorate, with Cu-O distances of 2.445 (11) and 2.721 (11) angstroms, respectively. Most of the remaining perchlorate O atoms are disordered.