Stereochemical features of bromine- and iodine-containing compounds of lanthanides

The Voronoi-Dirichlet (VD) polyhedra and the intersecting spheres method have been used to analyze the features of the environment of lanthanide (Ln) atoms consisting of bromine and iodine atoms in the structures of 94 compounds containing 96 LnBr _n complexes and 41 LnI _n complexes. The lanthanum CN with respect to halogen atoms varies from 6 to 9. The volume of the VD polyhedra of Ln atoms depends only on the oxidation state of the metal atom and the nature of the surrounding atoms.