(4'-Ferrocenyl-2,2':6',2''-terpyridine-κN,N',N'')(1,10-phenanthroline-κN,N')copper(II) bis(perchlorate) acetonitrile solvate.

The title complex, [CuFe(C(5)H(5))(C(20)H(14)N(3))(C(12)H(8)N(2))](ClO(4))(2)·C(2)H(3)N, consists of a mononuclear [Cu(C(12)H(8)N(2))(C(25)H(19)FeN(3))](2+) cation, two ClO(4) (-) anions (one of which is disordered over two positions with equal occupancy) and one CH(3)CN solvent mol-ecule. The Cu(II) center has a distorted square-pyramidal coordination with three N atoms of the 4'-ferrocenyl-2,2':6',2''- terpyridine (fctpy) ligand and one 1,10-phenanthroline (phen) N atom in the basal plane and a second phen N atom in the apical position with an axial distance of 2.254 (4) Å. The disordered ClO(4) (-) anion is weakly coordin-ated to the Cu(II) ion with a Cu-O distance of 2.766 (11) Å. The two cyclo-penta-dienyl rings of the ferrocenyl group are almost eclipsed with a deviation of 4.7 (1) °, and are involved in inter-molecular π-π inter-actions with the outer pyridyl rings of the fctpy ligands [centroid-centroid distance = 3.759 (2) Å.].