期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 61, 页码 13957-13965出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202002293
关键词
chiral induction; chirality; defects; metal-organic frameworks; post-synthetic modifications; vibrational circular dichroism
资金
- TOP-PUNT grant from the Netherlands Organisation for Scientific Research (NWO)
The synthesis of chiral metal-organic frameworks (MOFs) is highly relevant for asymmetric heterogenous catalysis, yet very challenging. Chiral MOFs with MOF-74 topology were synthesised by using post-synthetic modification with proline. Vibrational circular dichroism studies demonstrate that proline is the source of chirality. The solvents used in the synthesis play a key role in tuning the loading of proline and its interaction with the MOF-74 framework. InN,N '-dimethylformamide, proline coordinates monodentate to the Zn(2+)ions within the MOF-74 framework, whereas it is only weakly bound to the framework when using methanol as solvent. Introducing chirality within the MOF-74 framework also leads to the formation of defects, with both the organic linker and metal ions missing from the framework. The formation of defects combined with the coordination of DMF and proline within the framework leads to a pore blocking effect. This is confirmed by adsorption studies and testing of the chiral MOFs in the asymmetric aldol reaction between acetone andpara-nitrobenzaldehyde.
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