CRYSTAL AND MOLECULAR-STRUCTURES OF IS-(5-METHYL-5-BUTOXY-HEXANEDIONATO-2,4)COPPER(II) AND IMETHYL-5-CYCLOHEXYL-PENTANEDIONATO-3,5)COPPER(II)

Two new volatile complexes of Cu(II) containing methoxy groups were st udied in a combined X-ray diffraction investigation of the mono-(KUMA automatic diffractometer, MoKalpha radiation) and polycrystals (DRON-3 M, CuKalpha radiation). The structures are molecular and consist of th e trans-complexes of s-(5-methyl-5-butoxy-hexanedionato-2,4)copper(II) , C22H38CuO6, and imethyl-5-cyclohexylpentanedionato-3,5)copper(II), C 28H46CuO6. The crystal data of C22H38CuO6: a = 8.939(1), b = 8.887(2), c = 8.326(1) Angstrom, alpha = 107.92(2), beta = 108.15(1), gamma = 8 5.52(2)degrees, space group P1, V = 597.9(2) Angstrom(3), Z = 1, d(x) = 1.283 g/cm(3). The crystal data of C28H46CuO6: a = 18.625(3), b = 16 .126(2), c = 13.613(3) Angstrom, beta = 132.19 degrees, space group P2 (1)/n, V = 3029.3(9) Angstrom(3), Z = 4, d(x) = 1.189 g/cm(3). In both cases, the square planar environment of the Cu atom with Cu ... O dis tances of 1.90 Angstrom is completed by interactions with two carbon a toms of the terminal groups of the two neighboring molecules at Cu ... C distances of 3.66 Angstrom (average).