One-step synthesis, characterisation and properties of core/shell silicogermanate zeotype crystals

Attfield, Martin P.; Al-Ebini, Yousef; Hill, Patrick

doi:10.1039/c0jm01429j

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…For example, in Na 4 Ge 9 O 20 , 7 IM-14 14 and LNM-1 15 with the Ge-pharmacosiderite structure, different clusters were selected as the building unit, making the comparison between these structures difficult. Moreover, disorders often appear in germanates, 5,16 which makes the structure determination and description very complicated.…”

Section: Introductionmentioning

confidence: 99%

SU-75: a disordered Ge10 germanate with pcu topology

et al. 2012

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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 I42d (No. 122) with a = 18.145(3) Å and c = 41.701(9) Å. 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(2)SDA)(2)(H(2)O)(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.

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