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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >SU-75: A disordered Ge _(10) germanate with pcu topology
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SU-75: A disordered Ge _(10) germanate with pcu topology

机译:SU-75:具有pcu拓扑的无序Ge _(10)德国人

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摘要

A disordered open-framework germanate, denoted as SU-75, was synthesized under hydrothermal conditions using diethylenetriamine (dien) or alternatively 1,4-diaminobutane (dab) as the structure directing agent (SDA). SU-75 crystallizes in a tetragonal space group I42d (No. 122) with a = 18.145(3) ? and c = 41.701(9) ?. The three-dimensional (3D) framework is built from Ge _(10)(O,OH) _(28) (Ge _(10)) clusters that are connected following the pcu (primitive cubic) net topology. SU-75 has 10-, 11- and 12-ring channels along the a- and b-axes and channels with alternating 8-, 10-, 12-, 10-ring openings along the c-axis. The framework exhibits a serious disorder, resulted from two possible connectivities between the units of four Ge _(10) clusters (4Ge 10 unit). The chemical formula of SU-75 is (H _2SDA) _2(H _2O) _n[Ge _(10)O _(21)(OH) _2] (SDA = dien or dab, n = 5-6), determined by combining single crystal synchrotron X-ray diffraction, thermogravimetric analysis (TGA) and CHN elemental analysis. A superoctahedron is introduced to simplify the description of the connectivity of the Ge _(10) clusters and to illustrate the disorder. This is also used to compare the structure of SU-75 with those of related Ge _(10) germanates.
机译:使用二亚乙基三胺(dien)或1,4-二氨基丁烷(dab)作为结构导向剂(SDA)在水热条件下合成了无序的开放骨架锗酸盐,称为SU-75。 SU-75在I = 18.145(3)≤α的四方空间群I42d(122号)中结晶。并且c = 41.701(9)?。三维(3D)框架由Ge_(10)(O,OH)_(28)(Ge _(10))群集构建而成,这些群集按照pcu(原始立方)网络拓扑进行连接。 SU-75在a轴和b轴上具有10环,11环和12环的通道,在c轴上具有交替的8环,10环,12环,10环的开口。该框架表现出严重的混乱,这是由四个Ge _(10)簇的单元(4Ge 10单元)之间的两种可能的连通性导致的。 SU-75的化学式为(H _2SDA)_2(H _2O)_n [Ge _(10)O _(21)(OH)_2](SDA = dien或dab,n = 5-6),由下式确定结合了单晶同步加速器X射线衍射,热重分析(TGA)和CHN元素分析。引入了一个超级八面体来简化对Ge_(10)团簇的连通性的描述并说明这种无序现象。这也用于比较SU-75与相关的Ge_(10)锗酸盐的结构。

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