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Crystal structures of hydrates of simple inorganic salts. II. Water‐rich calcium bromide and iodide hydrates: CaBr 2 ·9H 2 O, CaI 2 ·8H 2 O, CaI 2 ·7H 2 O and CaI 2 ·6.5H 2 O
Author(s) -
Hennings Erik,
Schmidt Horst,
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/s2053229614018002
Subject(s) - iodide , chemistry , hydrate , bromide , calcium , aqueous solution , inorganic chemistry , mineralogy , crystallography , organic chemistry
Single crystals of calcium bromide enneahydrate, CaBr 2 ·9H 2 O, calcium iodide octahydrate, CaI 2 ·8H 2 O, calcium iodide heptahydrate, CaI 2 ·7H 2 O, and calcium iodide 6.5‐hydrate, CaI 2 ·6.5H 2 O, were grown from their aqueous solutions at and below room temperature according to the solid–liquid phase diagram. The crystal structure of CaI 2 ·6.5H 2 O was redetermined. All four structures are built up from distorted Ca(H 2 O) 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.