Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 10 (October 2004)

inorganic compounds

Acta Cryst. (2004). C60, i97-i100 [ doi:10.1107/S0108270104017986 ]

Calcium and strontium thiosulfate, CaS₂O₃·6H₂O and SrS₂O₃·5H₂O

P. Held and L. Bohatý

Abstract: In contrast to former morphological studies, the results presented here show that calcium(II) thiosulfate hexahydrate, CaS₂O₃·6H₂O, crystallizes centrosymmetrically in the pinacoidal class (point group $\overline 1$ ). The structure is characterized by chains, parallel to [100], of alternating S₂O₃ and Ca(H₂O)₆O₂ groups sharing common O atoms. The composition of each chain link is [Ca(H₂O)₆(S₂O₃)]. The geometry is analysed and compared in detail with the structural features of monoclinic strontium(II) thiosulfate pentahydrate, SrS₂O₃·5H₂O, which forms layers, parallel to (100), of alternating S₂O₃ and Sr(H₂O)₄O₅ groups connected via common O atoms and O-O edges. Each layer contains [Sr(H₂O)₃O(S₂O₃)] as the unique repeat unit.

Formula: CaS₂O₃·6H₂O and SrS₂O₃·5H₂O


	Structure factor file (CIF format) (128.5 kbytes) Contains datablock I

	Structure factor file (CIF format) (137.2 kbytes) Contains datablock p_1b

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