Thermoanalytical (TG-DTA-DTG) investigations of uranium (VI) and thorium (IV) complexes of o-hydroxy N, N ′-dimethylbenzylamine in static air atmosphere

Abstract

Differential thermal and thermogravimetric analyses of actinide metal o-hydroxy N,N ′-dimethylbenzylamine complexes of the formulae, [LMO2X2], [LMO2SO4] and [LTh(NO3)4], where M = U, L= o-C6H4OHCH2N(CH3)2 and X = Cl2, NO3 - have been carried out to explore their degradation patterns. The evolved products were identified on the basis of loss in weight on TG coupled with DTA curves. The thermal decomposition of these complexes occurred with the loss of inorganic and organic fragments and exhibited almost similar mode of degradation with minor differences. The composition of the intermediates formed during degradation was confirmed by microanalysis and IR spectroscopy. The residues, after heating above 545°C, corresponded to metal oxides. Degradation mechanisms of these complexes have also been proposed.