THERMOANALYTICAL STUDIES ON VOLATILE COMPLEXES CONTAINING ALKALI-METALS

Alkali metal-containing complexes with 2,2,6,6-tetramethyl-3,5-heptane dione (thd) and trifluoroacetylacetone (tfa) as ligands were studied b y TG, DTA, DSC and MS methods. Of the complexes studied, Na(thd) and K (thd) sublimed completely, and NaPr(tfa)(4) and KPr(tfa)(4) sublimed a lmost completely in vacuum, but in an inert atmosphere the weight rema ining was up to approximate to 20%. Surprisingly, KPr(tfa)(4) had high er volatility than the corresponding sodium complex. The strongest pea ks in the mass spectra of the double complexes were due to NaPr(tfa)(3 ) and KPr(tfa)(3). The mass spectra of Na(thd) and K(thd) showed sever al different species. One thd ligand was always bonded to one or sever al alkali metal ions. The strongest peaks in both spectra were those d ue to M(3)thd(2) and M(2)thd.