Strontium and Barium Derivatives

Single crystals of Ba(NH2)2 have been prepared by the prolonged reaction of Ba metal with liquid there are two crystallographically independent 

Ba ions, with irregular eight- and seven-fold co-ordination. The kinetics of the thermal decomposition (608—643 K) of barium formate have been ascertained. Decomposition occurs via two major modes [equations (6) and (7)], with small amounts of HCHO, elemental C, and O2 also being formed. 

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Strontium and Barium Derivatives.— Crystals of strontium violurate tetrahydrate are monoclinic, of space group P2Ja, with a = 2.217, b = 0.498, c = 1.447 nm, 3 = 104°." The molecular structure (Figure 10) is such that the Sr ions are eight-co-ordinate, the environment being composed of seven oxygen atoms four water. 

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