共查询到20条相似文献,搜索用时 15 毫秒
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P. D. Robinson S. Jasty 《Acta Crystallographica. Section C, Structural Chemistry》1998,54(6):IUC9800021-IUC9800021
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镧系金属硫酸盐由于在稀土分离等方面具有重要的应用而受到广泛关注。但是,因其适于结构测定的单晶相对难以得到,迄今,关于稀土硫酸盐的结构报道仍然较少,且主要局限于水合硫酸盐和三元硫酸盐.近几年中,基于硫酸根与磷酸根在结构上的相似性,借鉴在水热/溶剂热体系中采用有机胺作模板剂大量合成具有空旷骨架结构的微孔磷酸盐的成功经验,以有机胺为模板剂合成具有空旷骨架结构的镧系金属硫酸盐的工作也已见诸报道.在这些化合物中,由于硫酸根配位方式的多样性和稀土元素配位数和配位构型的可调变性,展现出了一些有趣的结构特征. 相似文献
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Mathias S. Wickleder 《无机化学与普通化学杂志》1999,625(3):474-480
Acidic Sulfates of Neodymium: Synthesis and Crystal Structure of (H5O2)(H3O)2Nd(SO4)3 and (H3O)2Nd(HSO4)3SO4 Light violett single crystals of (H5O2)(H3O)2 · Nd(SO4)3 are obtained by cooling of a solution prepared by dissolving neodymium oxalate in sulfuric acid (80%). According to X‐ray single crystal investigations there are H3O+ ions and H5O2+ ions present in the monoclinic structure (P21/n, Z = 4, a = 1159.9(4), b = 710.9(3), c = 1594.7(6) pm, β = 96.75(4)°, Rall = 0.0260). Nd3+ is nine‐coordinate by oxygen atoms. The same coordination number is found for Nd3+ in the crystal structure of (H3O)2Nd(HSO4)3SO4 (triclinic, P1, Z = 2, a = 910.0(1), b = 940.3(1), c = 952.6(1) pm, α = 100.14(1)°, β = 112.35(1)°, γ = 105.01(1)°, Rall = 0.0283). The compound has been prepared by the reaction of Nd2O3 with chlorosulfonic acid in the presence of air. In the crystal structure both sulfate and hydrogensulfate groups occur. In both compounds pronounced hydrogen bonding is observed. 相似文献
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以哌嗪为模板剂, 在水热条件下合成了一个新的具有二维拓展骨架结构的稀土硫酸盐[C4N2H12]3[Ce2(SO4)6(H2O)2]·H2O, 并对其进行了结构表征和热分析. 单晶结构解析结果表明, 该化合物晶体属于单斜晶系, P21/c空间群, 晶体学参数a=0.66335(10) nm, b=2.8088(4) nm, c=1.02212(15) nm, β=96.160(2)°, V=1.8935(5) nm3, R1=0.0466, wR2=0.1226. 该化合物由[—Ce—S3—Ce—S1—Ce— S3—Ce—S1—]八元环连接形成二维层状结构, 无机层间通过氢键连接成三维无限结构. 相似文献
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On of the hydrogen bonds formed by water molecules in lithium selenate monohydrate is evidently stronger than in the corresponding sulfate, whereas the other one is weaker. The temperature dependence of the stretching and bending modes of water is similar in both compounds, their frequencies decreasing on lowering the temperature. The study of mixed sulfate—selenate compounds made it possible to clearly show that the effective symmetry of the tetrahedral ions is higher than their local crystallographic one. 相似文献
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Zaichao Zhang Zhibin Zhang 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(2):i9-i11
The crystal structure of oxonium neodymium bis(sulfate), (H3O)Nd(SO4)2, shows a two‐dimensional layered framework assembled from SO4 tetrahedra and NdO9 tricapped trigonal prisms. One independent sulfate group makes four S—O—Nd linkages, while the other makes five such connections to generate an unprecedented anhydrous anionic [Nd(SO4)2]− layer. To achieve charge balance, H3O+ cations are inserted between adjacent layers where they participate in hydrogen‐bonding interactions with the sulfate O atoms of adjacent layers. 相似文献
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B. El-Bali M. Bolte 《Acta Crystallographica. Section C, Structural Chemistry》1999,55(3):IUC9900015-IUC9900015
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Mosbah Jemmali Rached Ben Hassen Siwar Walha Petricek Vaclac 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(7):i73-i75
The crystal structure of potassium cerium(III) bis(sulfate) monohydrate, KCe(SO4)2·H2O, is built up from irregular independent SO4 tetrahedra, CeO9 polyhedra in the form of distorted tricapped trigonal prisms and K+ ions. Hydrogen bonding between the free water molecule and sulfate groups supplement the ionic bonds characteristic of the rest of the structure. 相似文献
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Masato Hashimoto Michiru Kubata Atsushi Yagasaki 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(12):1411-1412
The title compound, triammonium cis‐diaqua‐cis‐dioxo‐trans‐disulfatovanadate 1.5‐hydrate, was obtained by oxidizing VIV to VV in a 2 M sulfuric acid solution of vanadyl sulfate and adding ammonium sulfate. Here, the V atom is sandwiched by two sulfate groups by corner‐sharing to form a discrete [VO2(SO4)2(OH2)2]3? anion. The water molecules occupy cis positions in the equatorial plane of the vanadium octahedron. 相似文献