STRUCTURES OF AQUA AND PYRIDINE ADDUCTS OF DIMERIC COPPER(II) 2-CHLOROBENZOATE

Tetrakis(mu-2-chlorobenzoato-O,O')-bis-[aquacopper(II)], [Cu2(C7H4ClO2)4(H2O)2], (I), M(r) = 785.4, monoclinic, P2(1)/n, a = 7.214 (2), b = 19.554 (4), c = 10.877 (4) angstrom, beta = 103.82 (3)-degrees, V = 1489.9 (7) angstrom3, Z = 2, D(m) = 1.75 (2), D(x) = 1.75 Mg m-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 1.848 mm-1, F(000) = 788, T = 298 (2) K, R = 0.032 for 2536 observed reflections. Tetrakis(mu-2-chlorobenzoato-O,O')-bis[pyridinecopper(II)] di(tetra-chloromethane), [Cu2(C7H4ClO2)4(C5H5N)2].2CCl4, (II), M(r) = 1215.2, monoclinic, P2(1)/a, a = 23.365 (3), b = 10.688 (1), c = 20.542 (2) angstrom, beta = 100.03 (1)-degrees, V = 5051.5 (9) angstrom3, Z = 4, D(x) = 1.60 Mg m-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 1.533 mm-1, F(000) = 2424, T = 299 (2) K, R = 0.074 for 5124 reflections. The -2J value of (1) observed by magnetic susceptibility measurement is abnormally small (262 cm-1) among the copper benzoate complexes. This may be mainly a result of the bent structure of the Cu-O-C-O-Cu bridges.