TECHNETIUM CARBONYL BETA-DIKETONATES

A series of technetium(1) carbonyl beta-diketonates is synthesized for the first time. Acetylacetone, trifluoroacetylacetone, pivaloyltrifluoroacetone, and hexafluoroacetylacetone are used as the beta-diketones. The compounds are obtained in three chemical forms: tetracarbonyl beta-diketonates, dimeric unsolvated tricarbonyl beta-diketonates, and adducts of tricarbonyl beta-diketonates with neutral ligands (water, ethanol, diethylamine). The compounds are characterized by elemental analysis and IR and NMR spectroscopies. Their behavior on vacuum sublimation is studied. The tetracarbonyl beta-diketonates are unstable and readily convert to hydrates of tricarbonyl beta-diketonates. Adducts with diethylamine sublime without loss of neutral ligand. Adducts with ethanol desolvate on sublimation (except the hexafluoroacetylacetonate that retains the ethanol on sublimation). The dependence of the IR spectra and the sublimation behavior on the composition of the complexes and the nature of the ligands is analyzed.