SU-21, a layered silicogermanate with organic amines covalently-bonded to germanium

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• 作者：Liqiu Tang ; Xiaodong Zou
• 关键词：Germanates ; Silicogermanates ; Layered structures ; Organically-templated synthesis ; Hydro-/solvo-thermal synthesis
• 刊名：Microporous and Mesoporous Materials
• 出版年：2007
• 出版时间：19 April 2007
• 年：2007
• 卷：101
• 期：1-2
• 页码：24-29
• 全文大小：522 K

文摘

A novel silicogermanate, [(Ge_5.17Si_1.83)O₁₂(OH)₂F₂(NH₂CH₂CHNH₂CH₃)₂] · H₂O (denoted as SU-21), was synthesized in the presence of 1,2-diaminopropane under hydro-/solvo-thermal conditions. SU-21 was characterised by scanning electron microscopy (SEM), wave-dispersive spectroscopy (WDS), CHN analysis, FTIR and in situ X-ray powder diffraction (XRPD). The crystal structure of SU-21 was determined by single crystal X-ray diffraction. SU-21 is built up from chains formed by the zeolite secondary building unit 4-1. The chains are further connected by pairs of GeO₃FN₂ octahedra to form a layer. The organic molecules 1,2-diaminopropane are present in the structure and the two nitrogen atoms from each 1,2-diaminopropane are covalently-bonded to the germanium atoms in GeO₃FN₂ octahedra. The layers are held together via hydrogen bonding. SU-21 is thermally stable up to 210 °C.