THE CHEMISTRY OF BETA-DIKETONATE COPPER(I) COMPOUNDS .3. THE SYNTHESIS OF (BETA-DIKETONATE) CU(1,5-COD) COMPOUNDS, THE SOLID-STATE STRUCTURE AND DISPROPORTIONATION OF HEXAFLUOROACETYLACETONATO (1,5-CYCLOOCTADIENE)COPPER(I), (HFAC)CU(1,5-COD)

The compounds (beta-diketonate)Cu(1,5-COD) have been prepared by the reaction between [(1,5-COD)CuCl]2 and Na)beta-diketonate) for beta-diketonate = hexafluoroacetylacetonate (hfac), trifluoracetylacetonate (tfac) and acetylacetonate (acac) and 1,5-COD = 1,5-cyclooctadiene. These compounds were characterized spectroscopically and (hfac)Cu(1,5-COD) was characterized, in the solid state, by single-crystal X-ray diffraction. Crystal data:empirical formula, C13H13CuF6O2; crystal system, monoclinic; space group, P21/c; a = 10.011(2), b = 9.777(3), c = 15.658(3) angstrom and beta = 107.88(2)-degrees and Z = 4. The coordination of the copper centre is best described as ''3 + 1'' with an asymmetrically coordinated 1,5-COD ligand where the Cu-C(6) = C(7) centroid and Cu-C(10) = C(11) centroid distances are 1.953 and 2.418 angstrom, respectively. The quantitative disproportionation, according to the equation 2(hfac)Cu(1,5-COD) --> Cu + Cu(hfac)2 + 2(1,5-COD) to produce copper metal and volatile by-products, was observed at 200-degrees-C.