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Higher Hydrates of Lithium Chloride, Lithium Bromide and Lithium Iodide

Higher Hydrates of Lithium Chloride, Lithium Bromide and Lithium Iodide

Julia Sohr, Horst Schmidt, Wolfgang Voigt

Acta Crystallogr C Struct Chem. 2018 Feb 1;74(Pt 2):194-202.

PMID: 29400335

Abstract:

For lithium halides, LiX (X = Cl, Br and I), hydrates with a water content of 1, 2, 3 and 5 moles of water per formula unit are known as phases in aqueous solid-liquid equilibria. The crystal structures of the monohydrates of LiCl and LiBr are known, but no crystal structures have been reported so far for the higher hydrates, apart from LiI·3H2O. In this study, the crystal structures of the di- and trihydrates of lithium chloride, lithium bromide and lithium iodide, and the pentahydrates of lithium chloride and lithium bromide have been determined. In each hydrate, the lithium cation is coordinated octahedrally. The dihydrates crystallize in the NaCl·2H2O or NaI·2H2O type structure. Surprisingly, in the tri- and pentahydrates of LiCl and LiBr, one water molecule per Li+ ion remains uncoordinated. For LiI·3H2O, the LiClO4·3H2O structure type was confirmed and the H-atom positions have been fixed. The hydrogen-bond networks in the various structures are discussed in detail. Contrary to the monohydrates, the structures of the higher hydrates show no disorder.

Chemicals Related in the Paper:

Catalog Number	Product Name	CAS Number	Price
AP10377512	Lithium iodide	10377-51-2	Price
AP85017807	Lithium iodide hydrate	85017-80-7	Price
AP85017829	Lithium bromide hydrate	85017-82-9	Price

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