The title compounds were prepared by the action of copper nitrate or halide on bis[N-n-butyl(5-chloro--phenyl-2-hydroxybenzylidene)aminato] copper(II) which in turn was obtained from the reaction of copper(II) acetate with the n-butylamine adduct of 5-chloro-2-hydroxybenzophenone. The magnetic susceptibilities of the chloride, bromide, and nitrate adducts were determined as a function of temperature, and are interpreted in terms of binuclear molecules with the copper atoms in a four-co-ordinated, approximately planar, ligand environment, and bridged by the phenolic oxygens of the organic ligand. The electronic and i.r. spectra and a full three-dimensional X-ray crystal and molecular structure determination on the bromo complex support these conclusions. The precise environment about the [graphic omitted] bridge in the bromo complex, and particularly the copper atoms, is in good agreement with that expected from the strength of antiferromagnetic interaction. All the complexes are believed to be four-co-ordinated, though the chlorine adduct is a dihydrate and the possibility of water co-ordination cannot be ruled out completely. A number of the i.r. peaks could be assigned unambiguously. E.s.r. spectra at 300 and 77 K of the binuclear complexes revealed only peaks due to the small trace of the monomeric parent complex remaining in these compounds.