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:
Acta crystallographica. Section C, Crystal structure communications
影响因子:
--
通讯作者:
Fortes AD
Fortes AD
中科院分区:
--
文献类型:
--
作者:
Fortes AD

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五水合硫酸六水镁([Mg(H2O)6] SO 4·5 H2O)和五水合铬酸六水镁([Mg(H2O)6][CrO 4]·5 H2O)是同晶的,由六水镁(II)八面体[Mg(H2O)6]2+和硫酸盐(铬酸盐)四面体含氧阴离子SO 42 −(CrO 42 −)通过氢键连接而成。有两个中心对称的八面体:(0,0,0)处的M1直接与四面体含氧阴离子T1(0.405,0.320,0.201)处的氢键相连,而(0,0,{1 \over 2})处的M2八面体通过5个间隙水分子与含氧阴离子相连。用CrVI取代SVI导致T1的显著膨胀,因为Cr-O键比S-O键长约12%。这种膨胀通过氢键框架传播,使晶胞体积增加3.3%;这种化学诱导的应变的最大部分沿着B* 方向表现出来。铬酸盐化合物中的氢键由于更大的含氧阴离子而减轻了预期应变的20%,变得比硫酸盐类似物更短(即更强)和更线性。由其中一个间隙水分子捐赠的分叉氢键在铬酸盐类似物中明显更对称。
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.
中子粉末衍射测定MgSO4–11D2O(子午线石)的晶体结构和热膨胀张量
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