Vacuum sublimation of interaction products of neodymium and erbium dipivaloyl methanates with pivalic acid

Processes taking place during vacuum sublimation of solid complexes of individual rare earths prepared in the systems MDpm3-nHPiv-hexane (M = Nd, Er, HDpm - dipivaloylmethane, HPiv - pivalic acid, n = 1, 2, 3) were studied. It is pointed out that at n = 1 in the systems considered mixed ligand complexes of the composition ErDpm3 · HPiv and NdDpm2Piv are formed which disproportionate at different temperatures when heated in vacuum. It is revealed that the processes of the complexes disproportionation can be used to increase the efficiency of sublimation methods of neodymium and erbium dipivaloylmethanates mixture separation. 6 refs., 2 figs., 1 tab