Abstract
Porosity and chirality are two of the most important properties for materials in the chemical and pharmaceutical industry. Inorganic microporous materials such as zeolites have been widely used in ion-exchange, selective sorption/separation and catalytic processes. The pore size and shape in zeolites play important roles for specific applications1,2,3. Chiral inorganic microporous materials are particularly desirable with respect to their possible use in enantioselective sorption, separation and catalysis4. At present, among the 179 zeolite framework types reported, only three exhibit chiral frameworks5,6,7. Synthesizing enantiopure, porous tetrahedral framework structures represents a great challenge for chemists. Here, we report the silicogermanates SU-32 (polymorph A), SU-15 (polymorph B) (SU, Stockholm University) and a hypothetical polymorph C, all built by different stacking of a novel building layer. Whereas polymorphs B and C are achiral, each crystal of polymorph A exhibits only one hand and has an intrinsically chiral zeolite structure. SU-15 and SU-32 are thermally stable on calcination.
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Acknowledgements
The authors thank M. O’Keeffe and J. Yu for help and valuable discussions, R. Herbst-Irmer for help with the twinning problem of SU-15, and K. Jansson for assistance with SEM. This project is supported by the Swedish Research Council (VR) and the Swedish Governmental Agency for Innovation Systems (VINNOVA). L.S., C.B. and J.-L.S. are supported by post-doctoral grants from the Wenner-Gren Foundation and Carl-Trygger Foundation, respectively.
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L.-Q.T., L.S., H.-J.Y., A.O. and B.-L.L. synthesized the samples. L.-Q.T., L.S., J.-L.S. and M.K. carried out the characterization and crystallographic studies. C.B. and J.-L.S. carried out the topology analysis and geometry optimization. R.G.B. carried out the energy calculations. Z.B. and J.M. carried out the infrared microscopy. C.B. and X.-D.Z. wrote the major part of the manuscript. X.-D.Z. was responsible for project planning and coordination.
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Supplementary Figures S1–S8 and Supplementary Tables S1–S8 (PDF 771 kb)
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Tang, L., Shi, L., Bonneau, C. et al. A zeolite family with chiral and achiral structures built from the same building layer. Nature Mater 7, 381–385 (2008). https://doi.org/10.1038/nmat2169
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DOI: https://doi.org/10.1038/nmat2169
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