Crystal form and structure of ammonium hexaaquamagnesium trichloride, NH4[Mg(H2O)6]Cl3

Soláns, X.; Font‐Altaba, M.; Aguiló, Magdalena; Solans, J.; Domenech, V.

doi:10.1107/s0108270183008987

Cited by 17 publications

(12 citation statements)

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“…The crystal structure of synthetic NH 4 MgCl 3 •6H 2 O was described by Solans et al [57] and Marsh [58] without localization of hydrogen atoms. Recently, the crystal structure of novograblenovite, (NH 4 ,K)MgCl 3 •6H 2 O, was described in detail, including localization of hydrogen atoms, description of structural peculiarities and structural relationships with carnallite, KMgCl 3 •6H 2 O [10].…”

Section: Crystal Structuresmentioning

confidence: 99%

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

et al. 2019

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The technogenic mineral phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the burned dumps of the Chelyabinsk coal basin have been investigated by single-crystal X-ray diffraction, scanning electron microscopy and high-temperature powder X-ray diffraction. The NH4MgCl3·6H2O phase is monoclinic, space group C2/c, unit cell parameters a = 9.3091(9), b = 9.5353(7), c = 13.2941(12) Å, β = 90.089(8)° and V = 1180.05(18) Å3. The crystal structure of NH4MgCl3·6H2O was refined to R1 = 0.078 (wR2 = 0.185) on the basis of 1678 unique reflections. The (NH4)2Fe3+Cl5·H2O phase is orthorhombic, space group Pnma, unit cell parameters a = 13.725(2), b = 9.9365(16), c = 7.0370(11) Å and V = 959.7(3) Å3. The crystal structure of (NH4)2Fe3+Cl5·H2O was refined to R1 = 0.023 (wR2 = 0.066) on the basis of 2256 unique reflections. NH4MgCl3·6H2O is stable up to 90 °C and then transforms to the less hydrated phase isotypic to β-Rb(MnCl3)(H2O)2 (i.e., NH4MgCl3·2H2O), the latter phase being stable up to 150 °C. (NH4)2Fe3+Cl5·H2O is stable up to 120 °C and then transforms to an X-ray amorphous phase. Hydrogen bonds provide an important linkage between the main structural units and play the key role in determining structural stability and physical properties of the studied phases. The mineral phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O are isostructural with natural minerals novograblenovite and kremersite, respectively.

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Section: Crystal Structuresmentioning

confidence: 99%

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

et al. 2019

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“…(10,11) The only known exception is potassium chlorocarnallite which crystallizes in an orthorhombic crystal system. (12,13) Due to its different composition, lithium chlorocarnallite: Li(H 2 O)Cl·MgCl 2 ·6H 2 O, crystallizes in space group C2/m.…”

Section: Introductionmentioning

confidence: 99%

Discontinuities in the mixed-crystal series of isostructural carnallite-type double salts

Christov

1995

The Journal of Chemical Thermodynamics

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“…Several synthetic phases in the framework of AMg(H 2 O) 6 Cl 3 composition ( A = NH 4 , Rb and Cs) obtained in the course of fractional crystallization and slow evaporation from a solution, have been studied [Solans et al, 1983;Waizumi et al, 1991 a,b ;Marsh, 1992 a,b ]. All three varieties exhibit the same monoclinic perovskite-like crystal structure as established for novograblenovite (Table 8).…”

Section: Crystal Chemical and Genetic Relationships With Formula Analmentioning

confidence: 99%

The new mineral novograblenovite, (NH4,K)MgCl3·6H2O from the Tolbachik volcano, Kamchatka, Russia: mineral description and crystal structure

Okrugin

Kudaeva

Karimova

et al. 2018

MinMag

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Abstract:The new mineral novograblenovite, (NH 4 ,: 3.330 (100) (2 2 0), 2.976 (45) ( ̅ ), 2.353 (29) ( ̅ ), 3.825 (26) (2 0 2), 1.997 (25) ( ̅̅̅̅̅ 2). The density calculated from the empirical formula and the X-ray data is 1.504 g·cm -3 . The mineral is biaxial (+) with α = 1.469(2), β = 1.479(2), γ = 1.496(2) (λ = 589 nm); 2V (meas.) = 80(10) º and 2V (calc.) = 75.7º. The crystal structure (solved and refined using single-crystal X-ray diffraction data, R1 = 0.0423) is based on the perovskite-like network of (NH 4 ,K)Cl 6 -octahedra sharing chlorine vertices, and comprises [Mg(H 2 O) 6 ] 2+ groups in framework channels. The positions of all independent H atoms were obtained by difference Fourier techniques and refined isotropically. All oxygen, nitrogen and chlorine atoms are involved in the system of hydrogen bonding, acting as donors or acceptors. The formula resulting from the structure refinement is [(NH 4 ) 0.7 K 0.3 ]MgCl 3 ·6H 2 O. The mineral is named after Prokopiy Trifonovich Novograblenov, one of the researchers of Kamchatka Peninsula, a teacher, naturalist, geographer and geologist.

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Crystal form and structure of ammonium hexaaquamagnesium trichloride, NH4[Mg(H2O)6]Cl3

Cited by 17 publications

References 0 publications

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

Discontinuities in the mixed-crystal series of isostructural carnallite-type double salts

The new mineral novograblenovite, (NH4,K)MgCl3·6H2O from the Tolbachik volcano, Kamchatka, Russia: mineral description and crystal structure

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