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Issue 40, 2012
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SU-75: a disordered Ge10 germanate with pcu topology

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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 I[4 with combining macron]2d (No. 122) with a = 18.145(3) Å and c = 41.701(9) Å. The three-dimensional (3D) framework is built from Ge10(O,OH)28 (Ge10) 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 Ge10 clusters (4Ge10 unit). The chemical formula of SU-75 is |(H2SDA)2(H2O)n|[Ge10O21(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 Ge10 clusters and to illustrate the disorder. This is also used to compare the structure of SU-75 with those of related Ge10 germanates.

Graphical abstract: SU-75: a disordered Ge10 germanate with pcu topology

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Article information

09 Apr 2012
12 Jun 2012
First published
09 Jul 2012

Dalton Trans., 2012,41, 12358-12364
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SU-75: a disordered Ge10 germanate with pcu topology

S. Huang, A. K. Inge, S. Yang, K. E. Christensen, X. Zou and J. Sun, Dalton Trans., 2012, 41, 12358
DOI: 10.1039/C2DT30767G

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