SYNTHESIS AND CHARACTERIZATION OF LUOROACETYLACETONATO-(1,5-CYCLOOCTADIENE)SILVER(I) DIMER - AN UNUSUAL BETA-DIKETONATE COORDINATION MODE

The compound (hfac)Ag(1,5-cod) was synthesized by the reaction of 1,1, 1,5,5,5-hexafluoroacetylacetone (hfacH) with Ag2O and 1,5-cyclooctadie ne (1,5-cod) and characterized in the solid state by single-crystal X- ray diffraction. In contrast to the corresponding copper(I) compound ( hfac)Ag(1,5-cod)exhibited lower volatility and was found to be dimeric in the solid state, containing the two unusual beta-diketonate coordi nation modes, namely, mu4-eta2-hfac and mu2-hfac. The deterioration of the crystal and extensive disorder precluded a detailed comparison of the metrical parameters of this compound with other literature data. However, the solid-state FTIR data showed substantial differences in t he nu(C-O) and nu(C-C) stretching regions compared with the chelated h fac ligand in (hfac)Cu(1,5-cod). These data will be useful in assignin g the coordination mode of beta-diketonate ligands in metal-organic be ta-diketonate complexes by FTIR.