PKU-10: a new 3D open-framework germanate with 13-ring channels |
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| Authors: | Su Jie Wang Yingxia Wang Zheming Liao Fuhui Lin Jianhua |
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| Affiliation: | Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. |
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| Abstract: | PKU-10, a germanate with the formula [(CH(3))(4)N](3)Ge(11)O(19)(OH)(9), is synthesized under hydrothermal conditions, and its structure is determined by single-crystal X-ray diffraction data. PKU-10 possesses 3D intersected 13-ring channels and presents a new 6-connectedness linkage mode of the Ge(7) cluster, T(3)P(2)O, forming a pcu topological network. Each Ge(7) cluster is, in fact, surrounded by eight Ge(7) clusters in a nearly perfect cube because the hydrogen bonds between Ge(7) clusters are also taken into account. The structure-directing agent tetramethylammonium (TMA(+)) ions, locating in the channels, can be partially exchanged by Li(+) with retention of the germanate framework. The germanate framework collapses with decomposition of the TMA(+) ions at temperatures higher than 240 °C. |
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