mu-Cyano-bis(2,2':6',2''-terpyridine-N,N',N'')dicopper(II) perchlorate acetonitrile, [Cu-2(CN)(C15H11N3)(2)]-(ClO4)(3).CH3CN

The [Cu-2(terpy)(2)(CN)](3+) cation (terpy is 2,2':6',2 ''-terryridine) is non-centrosymmetric and contains two Cu-II centres bridged by a disordered cyano group. The overall geometry around both metallic centres can be described as a distorted octahedron. The equatorial coordination plane is occupied by the N atoms of the tridentate terpy ligand and by an atom (C* or N*) of the cyanide bridge. The axial positions for one Cu atom are occupied by O atoms of two perchlorate anions while, for the other Cu atom, a perchlorate ion and an acetonitrile molecule lie in trans positions.