W0184

Crystal Chemistry of the Cu(II) Halide/4,4'-Dimethyl-2,2'-bipyridine System. Roger D. Willett, George Pon and Eric Lavy, Department of Chemistry, Washington State University, Pullman, WA 99164 and Ashwani Vij, University Research, University of Idaho, Moscow, ID 83843

The crystal chemistry of the compounds obtained by the reaction of CuCl₂ and CuBr₂ with L = 4,4'-dimethyl-2,2'-bipyridine is reported. For the chloride series, compounds obtained include LCuCl₂.H₂O, (LCuCl₂)₂.H₂O, LCuCl₂(DMSO), (LH₂)Cu₂Cl₆ , (LH₂)Cu₂Cl₆, and (LH₂)CuCl₄. In the corresponding Br series, the following compounds were obtained: LCuBr₂, LCu₂Br₄, (LH₂)Cu₂Br₆, and (LH₂)CuBr₄. For LCuCl₂.H₂O, a five-coordinate CuN₂Cl₂O species of found, intermediate between square pyramidal and trigonal bipyramidal geometry. A similar geometry is found in LCuCl₂(DMSO). In (LCuCl₂)₂.H₂O, a five-coordinate chloro-bridged dimer is found. In contrast, LCuBr₂ contains stacks of square planar complexes with CuN₂Cl₂ coordination. The LCu₂X₄ compounds contain stacks of planar dimers in which one Cu atom has a planar CuN₂X₂ coordination while the other has a planar CuX₄ coordination. The (LH₂)Cu₂X₆ compounds contain stacks of Cu₂X₆^- dimers. Magnetic properties of several of the salts will be presented.