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    Home > Coatings News > Paints and Coatings Market > "Nature Chemistry" by Wang Xun of Tsinghua University: Revealing a new sub-nanometer two-dimensional material system constructed by a new type of graphene-like material "cluster alkene-like"

    "Nature Chemistry" by Wang Xun of Tsinghua University: Revealing a new sub-nanometer two-dimensional material system constructed by a new type of graphene-like material "cluster alkene-like"

    • Last Update: 2022-03-02
    • Source: Internet
    • Author: User
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    Two-dimensional layered materials, represented by graphene, exhibit remarkable electron delocalization behavior due to their unique intra-layer atomic connection, which leads to outstanding physical and chemical properties
    .
    Clusters have a definite number of atoms and a definite structure, and are a kind of condensed matter between atoms/molecules and nanocrystals.
    The sub-nanometer size of clusters enables single-molecule-level forces to dominate their self-assembly behavior.
    , which can be used as "super atoms" to construct a new sub-nanoscale low-dimensional material system

    .
    The electronic structure and chemical properties of clusters are similar to those of atoms/molecules.
    Cluster assemblies are a class of "super molecules" in which electrons may be shared by multiple clusters.
    For highly ordered two-dimensional cluster assemblies,
    Delocalized behavior of electrons between clusters with the same chemical environment may lead to unusual electronic structures and catalytic properties
    .

    Schematic diagram of the cluster alkene structure


    Based on this, Wang Xun's group from the Department of Chemistry, Tsinghua University reported for the first time a new class of graphene-like materials based on polymetallic oxygen clusters (POMs) - "cluster alkene-like"
    .
    Different from the previous two-dimensional material systems that use atoms and molecules as structural units, this cluster alkene uses sub-nanometer-scale clusters as structural units to construct a new type of sub-nanometer two-dimensional material system

    .
    The cluster alkenes showed great improvement in catalytic activity and stability for the epoxidation of olefins, and their turnover frequency (TOF) was 76.
    5 times higher than that of the unassembled clusters

    .
    The discrete Fourier transform (DFT) calculation results show that the electron delocalization behavior between clusters effectively reduces the activation energy of the material participating in the redox reaction, resulting in a significant improvement in the catalytic activity

    .
    Thirteen different element-substituted Keggin-type clusters can be used for the construction of cluster alkenes

    .
    This study reveals the unique electronic structure, outstanding catalytic properties and good structural universality of clustered ene-like materials, which is expected to inspire the design and synthesis of new cluster-based materials

    .


    The work was published in Nature Chemistry with the title of "Self-assembly of polyoxometalate clusters into two-dimensional clusterphene structures featuring hexagonal pores".
    The first author of the paper is Liu Qingda, a 16th-level doctoral student in the Department of Chemistry, Tsinghua University.
    The author is Professor Wang Xun of the Department of Chemistry

    .
    The research was supported by the National Natural Science Foundation of China, the key research and development projects of the Ministry of Science and Technology, and the Scientific Exploration Award

    .


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