title: Crystal structures of hydrates of simple inorganic salts. III. Water-rich aluminium halide hydrates: AlCl3 · 15H2O, AlBr3 · 15H2O, AlI3 · 15H2O, AlI3 · 17H2O and AlBr3 · 9H2O.
abstract: 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) · 15H2O, half of the Al(3+) cations are surrounded by two complete hydration spheres, with six H2O in the primary and 12 in the secondary. For the heptadecahydrate of aluminium iodide, this hydration was found for every Al(3+).
authors.affiliation: Institute of Inorganic Chemistry, TU Bergakademie Freiberg, Leipziger Strasse 29, Freiberg, D-09596, Germany.
authors.forename: Horst
authors.initials: H
authors.lastname: Schmidt
authors.affiliation: Institute of Inorganic Chemistry, TU Bergakademie Freiberg, Leipziger Strasse 29, Freiberg, D-09596, Germany.
authors.forename: Erik
authors.initials: E
authors.lastname: Hennings
authors.affiliation: Institute of Inorganic Chemistry, TU Bergakademie Freiberg, Leipziger Strasse 29, Freiberg, D-09596, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Voigt
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D000077410:Aluminum Chloride; D017607:Aluminum Compounds / Q000737:chemistry*; D002412:Cations / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007554:Isotopes / Q000737:chemistry; D012492:Salts / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D002412:Cations; D002712:Chlorides; D007554:Isotopes; D012492:Salts; D012996:Solutions; D014867:Water; D000077410:Aluminum Chloride; D000535:Aluminum
keywords: aluminium halide hydrates; chemistry of Mars; cryo-brines; crystal structure; electrolyte solutions; low-temperature hydrates; secondary hydration shell; water-rich aluminium salts