DIMERIC COPPER(II) 2-METHYL-2-PHENYLPROPANOATE ADDUCTS WITH WATER OR 2,6-LUTIDINE AND A MONOMERIC COPPER(II) TRIPHENYLACETATE ADDUCT WITH 2,6-LUTIDINE

The structures of diaquatetrakis(mu-2-methyl-phe-nylpropanoato-O:O')dicopper(II), [Cu(C10H11O2)2(H2O)]2 (I), bis(2,6-dimethylpyridine)tetrakis(mu-2-methyl-2-phenylpropanoato-O:O')dicopper(II) benzene solvate, [Cu(C10H11O2)2(C7H9N)]2-C6H6 (II) and trans-bis(2,6-dimethylpyridine)bis(triphenylacetato-O,O')copper(II), [Cu(C20H15O2)2(C7H9N)2] (III), have been determined by single-crystal X-ray diffraction. (I) and (II) are dinuclear Cu(II) complexes having cage structures and the coordination geometries around the Cu atoms are square pyramidal in (I) and distorted trigonal bipyramidal in (II). The Cu...Cu distances are 2.589 (1) and 2.907 (1) angstrom for (I) and (II), respectively. The coordination geometry in the monomeric copper complex (III) is square planar. The -2J values of (I) and (II) are 348 and 310 cm-1 respectively.