Abstract
SrS2O3·H2O was obtained from an aqueous solution of Na2S2O3 and Sr(NO3)2 and crystallizes in space group P with all atoms at general positions. The Sr2+ ion exhibits an [8+1] coordination defined by two terminal S and six O atoms of thio-sulfate ions, one of the latter at a longer distance, and by one O atom of a water mol-ecule. Two thio-sulfate anions act as bidentate, four as monodentate ligands. The structure consists of mainly ionically inter-acting layers lying parallel to the crystallographic ab plane. The layers are connected by O-H⋯S and O-H⋯O hydrogen bonds of moderate strength.
Highlights
Thiosulfuric acid and its salts are common topics in textbooks of inorganic chemistry, the preparation of the pure acid was achieved just recently by a sophisticated synthesis via reaction of Na2S2O3 and anhydrous HF (Hopfinger et al, 2018)
Thiosulfates of alkaline earth metals are solely known as hydrates
MgS2O3Á6H2O has been investigated by Elerman et al (1983) to determine its deformation electron density, and the first example of an S—H hydrogen bond that was confirmed by a single crystal-structure determination was found in BaS2O3ÁH2O (Manojlovic-Muir, 1969)
Summary
Thiosulfuric acid and its salts are common topics in textbooks of inorganic chemistry, the preparation of the pure acid was achieved just recently by a sophisticated synthesis via reaction of Na2S2O3 and anhydrous HF (Hopfinger et al, 2018). Thiosulfates of alkaline earth metals are solely known as hydrates. MgS2O3Á6H2O has been investigated by Elerman et al (1983) to determine its deformation electron density, and the first example of an S—H hydrogen bond that was confirmed by a single crystal-structure determination was found in BaS2O3ÁH2O (Manojlovic-Muir, 1969). To SrS2O3Á5H2O (Held & Bohaty, 2004), the title compound represents the second known crystal structure of a hydrate of strontium thiosulfate. As one route of preparation, the pentahydrate has been crystallized from aqueous solutions of Na2S2O3 and Sr(NO3), whereby these solutions were reported to show a tendency to decompose, inhibiting the growth of larger single crystals (Held & Bohaty, 2004). A possible step within the decomposition process, and maybe a competing product in a later stage of crystallization, might be associated with the monohydrate, the crystal structure of which is presented here
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