MgSO4·11H2O and MgCrO4·11H2O based on time-of-flight neutron single-crystal Laue data.
MgSO4·11H2O and MgCrO4·11H2O based on time-of-flight neutron single-crystal Laue data.
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MgSO4·11H2O 和 MgCrO4·11H2O 基于飞行时间中子单晶劳厄数据。
DOI:
10.1107/s0108270113005751
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Fortes AD
中科院分区:
文献类型:
--
作者:
Fortes AD
Hexaaquamagnesium(II) sulfate pentahydrate, [Mg(H2O)6]SO4·5H2O, and hexaaquamagnesium(II) chromate(II) pentahydrate, [Mg(H2O)6][CrO4]·5H2O, are isomorphous, being composed of hexaaquamagnesium(II) octahedra, [Mg(H2O)6]2+, and sulfate (chromate) tetrahedral oxyanions, SO42− (CrO42−), linked by hydrogen bonds. There are two symmetry-inequivalent centrosymmetric octahedra: M1 at (0, 0, 0) donates hydrogen bonds directly to the tetrahedral oxyanion, T1, at (0.405, 0.320, 0.201), whereas the M2 octahedron at (0, 0, {1 \over 2}) is linked to the oxyanion via five interstitial water molecules. Substitution of CrVI for SVI leads to a substantial expansion of T1, since the Cr—O bond is approximately 12% longer than the S—O bond. This expansion is propagated through the hydrogen-bonded framework to produce a 3.3% increase in unit-cell volume; the greatest part of this chemically induced strain is manifested along the b* direction. The hydrogen bonds in the chromate compound mitigate ∼20% of the expected strain due to the larger oxyanion, becoming shorter (i.e. stronger) and more linear than in the sulfate analogue. The bifurcated hydrogen bond donated by one of the interstitial water molecules is significantly more symmetrical in the chromate analogue.
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影响因子:
1.4
作者:
A. Fortes;I. Wood;K. Knight
通讯作者:
K. Knight
DOI:
--
发表时间:
2009
期刊:
Journal of Glaciology 55(189)
影响因子:
--
作者:
F.E.Genceli;S.Horikawa;Y.Iizuka;T.Sakurai;T.Hondoh;T.Kawamura;G.-J.Witkamp
通讯作者:
G.-J.Witkamp
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
U. Kolitsch;M. Fleck
通讯作者:
M. Fleck
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
K. Wirth;A. Dreiding
通讯作者:
A. Dreiding
DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
A. Clemente;L. M. Vila
通讯作者:
L. M. Vila