{μ-1,5-Bis[(E)-1-(2-pyrid-yl)ethyl-idene]carbonohydrazidato(1-)}bis-[chlorido-methano-lcopper(II)] perchlorate.

The title dinuclear copper complex, [Cu(2)(C(15)H(15)N(6)O)Cl(2)(CH(3)OH)(2)]ClO(4), was prepared by the reaction of copper(II) chloride with bis-[1-(2-pyrid-yl)ethyl-idene]carbonohydrazide in the presence of sodium perchlorate in a methanol solution. It features a mono-deprotonated bis-tridentate ligand, which coordinates to two independent Cu(II) ions, one of which is coordinated by pyridyl N, hydrazyl N and carbonyl O atoms. The second Cu(II) ion is coordinated by the pyridyl N and two hydrazyl N atoms from different hydrazyl groups. The coordination environments of both Cu(II) ions are completed by a chloride ion and a methanol mol-ecule. The dihedral angle between the pyridyl groups is 27.46 (10)°. The crystal packing is stabilized by O-H⋯O(perchlorate), O-H⋯Cl and N-H⋯Cl hydrogen bonding.