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Crystal structures of hydrates of simple inorganic salts. III. Water‐rich aluminium halide hydrates: AlCl 3 ·15H 2 O, AlBr 3 ·15H 2 O, AlI 3 ·15H 2 O, AlI 3 ·17H 2 O and AlBr 3 ·9H 2 O
Author(s) -
Schmidt Horst,
Hennings Erik,
Voigt Wolfgang
Publication year - 2014
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229614014302
Subject(s) - iodide , halide , bromide , aluminium , chemistry , inorganic chemistry , perchlorate , isostructural , chloride , hydrate , crystal structure , crystallography , ion , organic chemistry
Water‐rich aluminium halide hydrate structures are not known in the literature. The highest known water content per Al atom is nine for the perchlorate and fluoride. The nonahydrate of aluminium bromide, stable pentadecahydrates of aluminium chloride, bromide and iodide, and a metastable heptadecahydrate of the iodide have now been crystallized from low‐temperature solutions. The structures of these hydrates were determined and are discussed in terms of the development of cation hydration spheres. The pentadecahydrate of the chloride and bromide are isostructural. In AlI 3 ·15H 2 O, half of the Al 3+ cations are surrounded by two complete hydration spheres, with six H 2 O in the primary and 12 in the secondary. For the heptadecahydrate of aluminium iodide, this hydration was found for every Al 3+ .