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Showing 1–5 of 5 results
Advanced filters: Author: Hai-Sen Xu Clear advanced filters

  • Although polymers have been studied for well over a century, there are few examples of covalently linked polymer crystals synthesized directly from solution. Here, the authors demonstrate a strategy to synthesize single crystalline 1D metallo-covalent organic frameworks by combining dynamic covalent chemistry and metal-ligand coordination.

    • Hai-Sen Xu
    • Yi Luo
    • Kian Ping Loh
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-6

  • Layered COFs are attractive precursors for two-dimensional materials but they are difficult to cleave into mono- or few-layer sheets. Pseudorotaxane moieties have now been embedded into layered COFs to facilitate their cleavage into sheets of uniform thickness. Crown-ether macrocycles within the COF backbone bind to ionic viologen guests, leading to electrostatic repulsion between layers.

    • Xing Li
    • Hai-Sen Xu
    • Kian Ping Loh
    Research
    Nature Chemistry
    Volume: 12, P: 1115-1122

  • Encoding functionalities in covalent organic frameworks (COFs) is important for widening their application field but the development of fluorescent COFs is hampered by a lack of guiding design principles. Here the authors demonstrate tuning and switching of the photoluminescence in 2D COFs made of non-emissive building blocks.

    • Xing Li
    • Qiang Gao
    • Kian Ping Loh
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-9

  • Making highly crystalline covalent organic frameworks (COFs) is challenging and existing linkages used for constructing COFs are limited in terms of variety and functionality. Now, crystalline COFs with imidazopyridinium linkages, which serve as precursors to N-heterocyclic carbenes, have been synthesized, expanding the reactivity of COFs by incorporating chemical ambivalence (electrophilicity and nucleophilicity) into the linkages. The COFs are also used as cathode materials in lithium–sulfur batteries.

    • Xing Li
    • Kun Zhang
    • Kian Ping Loh
    Research
    Nature Synthesis
    Volume: 1, P: 382-392