title: Crystal structures of hydrates of simple inorganic salts. II. Water-rich calcium bromide and iodide hydrates: CaBr2 · 9H2O, CaI2 · 8H2O, CaI2 · 7H2O and CaI2 · 6.5H2O.
abstract: Single crystals of calcium bromide enneahydrate, CaBr(2) · 9H2O, calcium iodide octahydrate, CaI(2) · 8H2O, calcium iodide heptahydrate, CaI(2) · 7H2O, and calcium iodide 6.5-hydrate, CaI(2) · 6.5H2O, were grown from their aqueous solutions at and below room temperature according to the solid-liquid phase diagram. The crystal structure of CaI(2) · 6.5H2O was redetermined. All four structures are built up from distorted Ca(H2O)8 antiprisms. The antiprisms of the iodide hydrate structures are connected either via trigonal-plane-sharing or edge-sharing, forming dimeric units. The antiprisms in calcium bromide enneahydrate are monomeric.
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: 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: Wolfgang
authors.initials: W
authors.lastname: Voigt
mesh_terms: D001965:Bromides / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D007454:Iodides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D012492:Salts / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D001965:Bromides; D017610:Calcium Compounds; D007454:Iodides; D012492:Salts; D014867:Water; C113019:calcium bromide; D002118:Calcium
keywords: calcium halide hydrates; chemistry of Mars; crystal structure; low-temperature hydrates; water-rich calcium salts