Abstract
The analysis of crystal-chemical structural characteristics of alkali rare-earth nitrates was carried out on the basis of our own experimental data and the data reported in literature. Special attention was given to Ln coordination polyhedra. Their shape, symmetry and other properties are analyzed. Coordination numbers in all cases were 10 and 12. An atom of a rare earth tends to form a symmetrical coordination arrangement even in the case when it occupies a position without any symmetry elements. Alkali cations are of less influence on the structure formation, but rare-earth complexes with the same composition and stoichiometry sometimes have different structures, depending on individual features of the alkali cations. Three types of coordination of the Ln atoms by nitrate group were found: monodentate, bidentate and bridging bidentate (met in compounds without water molecules in the coordination sphere of a complex-forming ion).
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