SYNTHESIS AND MOLECULAR-STRUCTURE OF PROPYLENE-BIS(BENZOYLACETONEIMINATO)COPPER(II), [CU(BA)2-1,2-PD]

The title compound C23H24N2CuO2 (4 in Scheme 1) was prepared and characterized by IR, UV, and GC measurements. The structure was solved by direct methods, and full-matrix least-squares refinement of structural parameters led to a conventional R factor of 0.049 for 1879 reflections. The copper(II) atoms are in a nontetrahedrally distorted planar coordination. A disorde of the five-membered chelate ring has been observed: two alternative positions. A and B for C20, C21 and C22 were found and refined with constrained C-N and C-C bond length. In both A and B rings, connected by pseudosymmetry plane, the ethylene bridge shows the gauche conformation, with the methyl group in the axial position. The geometry of the molecule is discussed.