Redetermination of dipotassium trichloridostannate(II) chloride monohydrate

The title compound, K 2 [SnCl 3 ]Cl·H 2 O, is the prototype of some isostructural compounds of composition M 2 [Sn X 3 ] X ·H 2 O ( M = large monovalent cation; X = halogen). In comparison with a previous study based on photographic data [Kamenar & Grdenić (1962). J. Inorg. Nucl. Chem. 24 , 1039–1045], its crystal structure has now been redetermined using CCD-based data in order to gain more accurate values for bond lengths and angles within the [SnCl 3 ] − anion and to locate the H atoms. The [SnCl 3 ] − anion has a trigonal–pyramidal shape and exhibits crystallographic mirror symmetry. With the exception of the K + ion which is located on a general position, all other atoms are situated on crystallographic mirror planes. The coordination polyhedron of the cation may be described by means of nine atoms in the form of a monocapped square antiprism with seven typical K—Cl/O distances and two additional atoms at considerably longer distances. The positions of the H atoms of the water molecule (also lying on a crystallographic mirror plane) could be determined and confirm the existence of a bifurcated O—H...Cl hydrogen bond to neighbouring Cl atoms.

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