Abstract
1. The values of the thermodynamic radii (rt) of borohydride and aluminum hydride ions were calculated. 2. The crystal lattice energy of borohydrides and aluminum hydrides of IA and IIA were calculated on the basis of rt[ElH4−] according to the Kapustinskii equation, from the Born-Haber cycle; and by the method of comparative calculation. 3. The energy of formation of RbAlH4, addition of (H−) to [AlH3], and other conversions was calculated on the basis of the energy of formation of the gaseous aluminum hydride ion. 4. A correspondence was detected between the nature of the changes in the crystal lattice energy and certain properties of aluminum hydrides and borohydrides: the thermal stability, solubility, and ability for formation from the elementary substances.
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