Vacuum sublimation of magnesium and barium hexafluoroacetylacetonate mixtures. Crystal structure of magnesium hexafluoroacetylacetonate dihydrate

The behavior of magnesium and barium hexafluoroacetylacetonate mixtures on heating was studied by thermal analysis and vacuum sublimation methods. It was demonstrated that the transfer of the mixture components into the gas p hase and the sublimation of the pure compounds proceed under almost the sam e conditions. The lack of a notable mutual influence is explained by the fo rmation of a mechanical mixture of the components in the course of their cr ystallization. X-ray structural analysis was carried out for magnesium hexa fluoroacetylacetonate dihydrate Mg(Hfa)(2)(H2O)(2): space group C2/c, a = 2 1.419(8), b = 8.266(4), c = 9.777(4) Angstrom, beta = 96.39 degrees, V = 17 20.3(12) Angstrom(3), Z = 4, R-1 = 0.0550. The magnesium atom has a distort ed octahedral coordination environment with distances Mg-O 2.05-2.07 Angstr om.