Physico-Chemical Study of Barium (II) Dipivaloylmethanate Nature

Abstract

A physico-chemical research of bis-(dipivaloylmethanato)barium(II) (Ba(thd)2) has been carried out from the point of its use in CVD processes as a precursor (thermal stability, immunity to external effects and etc.). The optimal conditions for synthesis, purification and storage have been found. It has been shown, that the sublimated product presents a mixture of several modifications with the main phase of a composition Ba 4 (thd) 8 . At a lowered pressure the sublimated product is preserved without decomposition for a long time. In the air it is a monomer of a composition Ba(thd) 2 *2H 2 O, decomposing in the course of time with forming a free ligand or a diketone (C 8 H 21 O 2 ) depending on the way of purification of the initial compound.