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    Single-Crystalline Ultrathin 2D Porous Nanosheets of Chiral Metal–Organic Frameworks

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    Type
    Article
    Authors
    Liu, Yuhao cc
    Liu, L. M. cc
    Chen, Xu
    Liu, Yan cc
    Han, Yu cc
    Cui, Yong cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Science and Engineering (BESE) Division
    Chemical Science Program
    Nanostructured Functional Materials (NFM) laboratory
    Physical Science and Engineering (PSE) Division
    Date
    2021-02-23
    Online Publication Date
    2021-02-23
    Print Publication Date
    2021-03-10
    Embargo End Date
    2022-02-23
    Submitted Date
    2020-12-15
    Permanent link to this record
    http://hdl.handle.net/10754/667669
    
    Metadata
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    Abstract
    Two-dimensional (2D) materials with highly ordered in-plane nanopores are crucial for numerous applications, but their rational synthesis and local structural characterization remain two grand challenges. We illustrate here that single-crystalline ultrathin 2D MOF nanosheets (MONs) with intrinsic porosity can be prepared by exfoliating layered metal-organic frameworks (MOFs), whose layers are stabilized by sterically bulky groups. As a result, three three-dimensional (3D) isostructural lanthanide MOFs possessing porous layer structures are constructed by coordinating metal ions with an angular dicarboxylate linker derived from chiral 1,1'-biphenyl phosphoric acid with pendant mesityl groups. The Eu-MOF is readily ultrasonic exfoliated into single-crystalline nanosheets with a thickness of ca. 6.0 nm (2 layers) and a lateral size of 1.5 × 3.0 μm2. The detailed structural information, i.e., the pore channels and individual organic and inorganic building units in the framework, is clearly visualized by a low-dose high-resolution transmission electron microscopy (HRTEM) technique. Benefiting from their ultrathin feature, the nanosheets are well embedded into the polymer matrix to form free-standing mixed-matrix membranes. In both the solution and membrane phase, the fluorescence of the MONs can be effectively quenched by a total of 17 chiral terpenes and terpenoids through supramolecular interactions with uncoordinated chiral phosphoric acids, leading to a chiral optical sensor for detecting vapor enantiomers, which is among the most challenging molecular recognition tasks.
    Citation
    Liu, Y., Liu, L., Chen, X., Liu, Y., Han, Y., & Cui, Y. (2021). Single-Crystalline Ultrathin 2D Porous Nanosheets of Chiral Metal–Organic Frameworks. Journal of the American Chemical Society. doi:10.1021/jacs.0c13005
    Sponsors
    This work was financially supported by the National Natural Science Foundation of China (Grants 21431004, 21620102001, 21875136, and 91856204), the National Key Basic Research Program of China (Grant 2016YFA0203400), and the Key Project of Basic Research of Shanghai (17JC1403100 and 18JC1413200).
    Publisher
    American Chemical Society (ACS)
    Journal
    Journal of the American Chemical Society
    DOI
    10.1021/jacs.0c13005
    PubMed ID
    33621078
    Additional Links
    https://pubs.acs.org/doi/10.1021/jacs.0c13005
    ae974a485f413a2113503eed53cd6c53
    10.1021/jacs.0c13005
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Science Program

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