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Crystal structure and characterization of magnesium carbonate chloride heptahydrate
Author(s) -
Rincke Christine,
Schmidt Horst,
Buth Gernot,
Voigt Wolfgang
Publication year - 2020
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/s2053229620008153
Subject(s) - monoclinic crystal system , crystal structure , crystallography , chloride , magnesium , octahedron , carbonate , chemistry , powder diffraction , x ray crystallography , crystal (programming language) , molecule , salt (chemistry) , infrared spectroscopy , inorganic chemistry , diffraction , organic chemistry , programming language , physics , computer science , optics
MgCO 3 ·MgCl 2 ·7H 2 O is the only known neutral magnesium carbonate containing chloride ions at ambient conditions. According to the literature, only small and twinned crystals of this double salt could be synthesised in a concentrated solution of MgCl 2 . For the crystal structure solution, single‐crystal diffraction was carried out at a synchrotron radiation source. The monoclinic crystal structure (space group Cc ) exhibits double chains of MgO octahedra linked by corners, connected by carbonate units and water molecules. The chloride ions are positioned between these double chains parallel to the (100) plane. Dry MgCO 3 ·MgCl 2 ·7H 2 O decomposes in the air to chlorartinite, Mg 2 (OH)Cl(CO 3 )· n H 2 O ( n = 2 or 3). This work includes an extensive characterization of the title compound by powder X‐ray diffraction, thermal analysis, SEM and vibrational spectroscopy.