Equilibrium in the system H<sub>2</sub>O‐MgBr<sub>2</sub>

Getman, Frederick H.

doi:10.1002/recl.19350541105

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…The discovery of decahydrate in magnesium dichloride hydrates may imply the existence of decahydrates in magnesium bromide and magnesium iodide. These were postulated on the basis of chemical analyses many years ago (Panfilowa, 1894;Getman, 1935), although their existence has been questioned in the recent literature (Hennings et al, 2013). Hennings et al (2013) concluded that the highest hydration number for both magnesium bromide and magnesium iodide is 9 based on their crystallization experiments.…”

Section: Structure Of Mgcl 2 á10d 2 Omentioning

confidence: 99%

Crystal structure of magnesium dichloride decahydrate determined by X-ray and neutron diffraction under high pressure

Komatsu

Shinozaki

Machida

et al. 2015

Acta Crystallogr B Struct Sci Cryst Eng Mater

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Magnesium dichloride decahydrate (MgCl2·10H2O) and its deuterated counterpart (MgCl2·10D2O) are identified for the first time by in-situ powder synchrotron X-ray and spallation neutron diffraction. These substances are crystallized from a previously unidentified nanocrystalline compound, which originates from an amorphous state at low temperature. A combination of a recently developed autoindexing procedure and the charge-flipping method reveals that the crystal structure of MgCl2·10H2O consists of an ABCABC··· sequence of Mg(H2O)6 octahedra. The Cl(-) anions and remaining water molecules unconnected to the Mg(2+) cations bind the octahedra, similar to other water-rich magnesium dichloride hydrates. The D positions in MgCl2·10D2O, determined by the difference Fourier methods using the neutron powder diffraction patterns at 2.5 GPa, show the features such as bifurcated hydrogen bonds and tetrahedrally coordinated O atoms, which were not found in other forms of magnesium chloride hydrates.

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Section: Structure Of Mgcl 2 á10d 2 Omentioning

confidence: 99%

Crystal structure of magnesium dichloride decahydrate determined by X-ray and neutron diffraction under high pressure

Komatsu

Shinozaki

Machida

et al. 2015

Acta Crystallogr B Struct Sci Cryst Eng Mater

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“…MgBr 2 Á10H 2 O is reported as the most water-rich magnesium bromide solid phase at low temperatures in the solid-liquid phase diagram (Panfilowa, 1894;Getman, 1935). However, composition data were derived from chemical analyses, which were difficult to perform with the unstable crystals at ambient temperature.…”

Section: Nonahydrates Of Mgbr 2 and Mgimentioning

confidence: 99%

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

Hennings

Schmidt

Voigt

2013

Acta Crystallogr C Cryst Struct Commun

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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 MgCl2·8H2O (magnesium dichloride octahydrate), MgCl2·12H2O (magnesium dichloride dodecahydrate), MgBr2·6H2O (magnesium dibromide hexahydrate), MgBr2·9H2O (magnesium dibromide nonahydrate), MgI2·8H2O (magnesium diiodide octahydrate) and MgI2·9H2O (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...X hydrogen bonds.

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The transition temperature of magnesium bromide

Getman

1938

Recl. Trav. Chim. Pays‐Bas

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The transition temperature of magnesium bromide has been measured by the thermometric method and found to be 10.84".In a previous communication on the equilibrium in the system H,O-MgBr, 1 ) . the temperature a t which magnesium bromide decahydrate undergoes transition into the hexahydrate, as estimated from the intersection of the solubility curves of the two salts, was found to be 0.83'. Owing to the relatively larger errors inherent in measurements of solubility at temperatures below zero, together with the fact that magnesium bromide hexahydrate tends to remain unchanged below the transition temperature, thereby becoming metastable, it follows that the previously recorded value of the transition temperature is probably erroneous. With a view to clearing up this uncertainty, the following determination of the transition temperature by the familiar thermometric method was undertaken.Into the freezing-tube of an ordinary B e c k m a n n apparatus was introduced a quantity of M e r c k ' s purest magnesium bromide.together with sufficient distilled water to produce a soft crystalline mush a t room-temperature. A special mercury thermometer having a scale ranging from -36' to + 5 4 O and reading to 0.2' was employed in the preliminary measurements. This thermometer, as well as the thermometers subsequently employed, had been checked by the U. S. Bureau of Standards, and all of the thermometric readings were corrected in the usual manner. T h e cooling bath of the B e c k m a n n apparatus was maintained at a temperature approximately 2' above the transition temperature, as determined in a series of preliminary trials. O n account of the marked tendency of the hexahydrate to exhibit suspended transformation, the mixture of the salt and water

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Equilibrium in the system H₂O‐MgBr₂

Cited by 8 publications

References 3 publications

Crystal structure of magnesium dichloride decahydrate determined by X-ray and neutron diffraction under high pressure

Crystal structure of magnesium dichloride decahydrate determined by X-ray and neutron diffraction under high pressure

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

The transition temperature of magnesium bromide

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Equilibrium in the system H2O‐MgBr2

Cited by 8 publications

References 3 publications

Crystal structure of magnesium dichloride decahydrate determined by X-ray and neutron diffraction under high pressure

Crystal structure of magnesium dichloride decahydrate determined by X-ray and neutron diffraction under high pressure

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

The transition temperature of magnesium bromide

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Equilibrium in the system H₂O‐MgBr₂

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