Alkaline-earth metal complexes with pivaloylacetone

Pivaloylacetonates of alkaline-earth elements with composition M(Pa)(2) . nH(2)O (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 o-phenanthroline were synthesized and characterized.