Gärtner Stefanie, Suchentrunk Christof, Korber Nikolaus
University of Regensburg, Institute of Inorganic Chemistry, Universitätsstrasse 31, Regensburg 93051, Germany.
Acta Crystallogr C Struct Chem. 2014 Nov;70(Pt 11):1036-9. doi: 10.1107/S2053229614021998. Epub 2014 Oct 11.
The involvement of two different alkali cations in the nonagermanide ammoniate Cs(3.2)Na(0.8)Ge9·5.3NH3 [tricaesium sodium nonagermanide-ammonia (1/5.3)] provides insights into the coordination behaviour of ammonia towards sodium and caesium cations within one compound and represents the first mixed-cationic solvate structure of nonagermanide tetraanions. The compound crystallizes in the monoclinic space group P2₁/m and, with the presence of pseudomerohedral twinning, mixed-cation sites and disordering of the nonagermanide cage anions, features a combination of crystallographic challenges which could all be resolved during the refinement.
