Alkaline-Earth Metal Complexes with Pivaloylacetone

Pivaloylacetonates of alkaline-earth elements with composition M(Pa)₂ · nH₂O (n = 1, M = Sr, Ca; n = 0, 2, M = Ba) were synthesized and studied by IR and thermal analysis; their solubilities and volatility were estimated. It was found that the volatility changes regularly in the series M(Acac)₂–M(Pa)₂–M(Thd)₂ (HAcac is acetylacetone, HThd is dipivaloylmethane). The replacement of one methyl radical by the tert-butyl radical when going from acetylacetonates to pivaloylacetonates was shown to noticeably increase the volatility only for Sr(Pa)₂ · H₂O. Complexes of barium pivaloylacetonate with tetraglyme and -phenanthroline were synthesized and characterized.