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An open-framework silicogermanate regularly constructed from natrolite zeolite chains and Ge9O18(OH)4 clusters
Donghui Jo1, Wanuk Choi1, Jiho Shin1
1Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang 37673, Korea. sbhong@postech.ac.kr.
Abstract:
Here we describe the synthesis and structure of PST-18, a novel open-framework silicogermanate with Si/Ge ∼ 0.6, which contains a three-dimensional pore system consisting of large cuboid-shaped cavities with 8-ring windows, as well as with 7-rings interrupted by one OH group. Synchrotron single-crystal X-ray diffraction reveals that the structure of PST-18, synthesized using only tetramethylammonium fluoride as a structure-directing agent, is built up of natrolite zeolite chains and Ge9O18(OH)4 clusters in a fully ordered manner. The discovery of such a hybrid structure of zeolitic building units and non-zeolitic oxide clusters provides a new direction for expanding the structural regime of inorganic microporous crystalline materials.
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