[μ-N,N,N′,N′-Tetrakis(2-pyridylmethyl)-butane-1,4-diamine] bis[dibromidocopper(II)]trihydrate

The title dinuclear copper complex, [Cu₂Cl₄(C ₂₈H₃₂N₆)]·3H₂O, is located on a crystallographic inversion center. The unique Cu^II ion is coordinated in a slightly distorted square-pyramidal environment in which the N atoms of the dipicolyl-amine group and a chloride ligand form the basal plane. The apical position is occupied by a second chloride atom. While the Cu - N distances of the pyridine N atoms are the same within expermental error, the Cu - N distance to the tertiary N atom is slightly elongated. The apical Cu - Cl distance is elongated due to typical Jahn-Teller distortion. One of the water O atoms was refined as disordered over two sites with occupancies 0.734 (17):0.266 (17) and another with half occupancy. H atoms for the disordered solvent atoms were not included in the refinement.