Abstract
Thorium(IV) nitrate and thiocyanate react with bidentate Schiff base ligands, furfurylidenearylamines, forming violet coloured non-electrolytic solids of composition Th(SB) n X 4 (SB = furfurylidenearylamine; X = NO 3, n = 2; X = NCS, n = 2, 3), characterised by analytical data and IR spectra. Thermogravimetric studies of these complexes reveal the formation of intermediate decomposition species, whose stoichiometry and mechanism of formation are discussed. The complexes start losing weight around 80 ° C, but lose the ligands in a stepwise manner beyond 170°C finally forming ThO 2 as the ultimate end product above 650 °C. These complexes are shown to be thermally less stable than the analogous dioxouranium(VI) complexes.
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