Crystal structures of hydrates of simple inorganic salts. I. Water-rich magnesium halide hydrates MgCl2•8H2O, MgCl2•12H2O, MgBr2•6H2O, MgBr2•9H2O, MgI2•8H2O and MgI2•9H2O
Crystal structures of hydrates of simple inorganic salts. I. Water-rich magnesium halide hydrates MgCl2•8H2O, MgCl2•12H2O, MgBr2•6H2O, MgBr2•9H2O, MgI2•8H2O and MgI2•9H2O
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DOI：
10.1107/s0108270113028138
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发表时间：
2013-11-01
期刊：
影响因子：
--
通讯作者：
Voigt, Wolfgang
中科院分区：
文献类型：
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作者：
Hennings, Erik;Schmidt, Horst;Voigt, Wolfgang
先前报道的在室温下结晶的简单无机盐的水合物的结构通常已被确定。对于在低于 273 K 的温度下结晶的富水水合物而言，情况并非如此。在本系列中，研究了在低温下从水溶液中结晶的富水水合物的晶体结构。本文报道了一组镁盐的结构。 MgCl28中心点H2O（八水二氯化镁）、MgCl2中心点12H(2)O（十二水二氯化镁）、MgBr2中心点6H(2)O（六水二溴化镁）、MgBr2中心点9H(2)O（九水二溴化镁）、MgI2中心点的晶体根据固-液相图，在低于 298 K 的温度下从它们的水溶液中生长出 8H(2)O（八水合二碘化镁）和 MgI2 中心点 9H(2)O（九水合二碘化镁）。所有结构均由 Mg(H2O)(6) 八面体构成。六水阳离子配合物的尺寸和角度非常相似并且变化不是系统性的。阴离子被纳入 O-H 中心点 X 氢键的特定网络中。
The previously reported structures of the hydrates of simple inorganic salts that crystallize at room temperature are generally well determined. This is not true for water-rich hydrates, which crystallize at temperatures below 273 K. In this series, investigations of the crystal structures of water-rich hydrates crystallized from aqueous solutions at low temperatures are presented. Reported herein are the structures of a set of magnesium salts. Crystals of MgCl28 center dot H2O (magnesium dichloride octahydrate), MgCl2 center dot 12H(2)O (magnesium dichloride dodecahydrate), MgBr2 center dot 6H(2)O (magnesium dibromide hexahydrate), MgBr2 center dot 9H(2)O (magnesium dibromide nonahydrate), MgI2 center dot 8H(2)O (magnesium diiodide octahydrate) and MgI2 center dot 9H(2)O (magnesium diiodide nonahydrate) were grown from their aqueous solutions at temperatures below 298 K according to the solid-liquid phase diagrams. All structures are built up from Mg(H2O)(6) octahedra. Dimensions and angles in the hexaaqua cation complexes are very similar and variation is not systematic. The anions are incorporated into a specific network of O-H center dot center dot center dot X hydrogen bonds.