The crystal structure of bis(ethylammonium) pentachloroantimonate(III)-ethylammonium chloride (C2H5NH3)(2)SbCl5 center dot(C2H5NH3)Cl at 295 and 90 K. On the deformation of the octahedral coordination of Sb-III

Bis(ethylammonium) pentachloroantimonate(III)-ethylammonium chloride belong s to alkylammonium chloroantimonates(III). The anionic sublattice of (C2H5N H3)(2)SbCl5.(C2H5NH3)Cl is built of isolated Sb2Cl104- units composed of tw o SbCl63- octahedra, connected by edge and two single chlorine Cl- ions. Th ere are three crystallographically non-equivalent ethylammonium cations, tw o of them are disordered at room temperature and all of them are ordered at 90 K. The disorder is realized by two positions for carbon atoms. Ethylamm onium cations are connected to the anionic sublattice by N-H...Cl hydrogen bonds. The influence of temperature and hydrogen bonds together with electr ostatic interactions on the deformation of the octahedral coordination of S b-III is discussed.