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• W4386272007 abstract "Vinylene-linked covalent organic frameworks (COFs) are emerging as promising crystalline materials, but their narrow pore engineering is severely impeded by the weak reversibility of the carbon-carbon double bond formation reaction, which has led to less exploration of their ultramicroporous structures and properties. Herein, we developed a single aromatic ring-based tetratopic monomer, tetramethylpyrazine, which undergoes a smooth Knoevenegal condensation at its four arylmethly carbon atoms with linear aromatic dialdehyde monomers upon the self-catalyzed activation of pyridine nitrogen-containing monomers in the presence of an organic anhydride. This has resulted in the formation of two vinylene-linked COFs, which both crystallized in orthorhombic lattices, and layered in AA stacking fashions along the vertical directions. They exhibit high surface areas and well-tailored ultramicropore sizes up to 0.5 nm. The unique cross-linking mode at two pairs of para-positions of each pyrazine unit through carbon-carbon double bonds afford them with π-extended conjugation over the in-plane backbones and substantial semiconducting characters. The resultant COFs can be well-dispersed in water to form stable sub-microparticles with negative charges (zeta potentials: ca. -30 mV), and exhibiting tunable aggregation behaviors through protonation/deprotonation. As a consequence, they exhibit pore-size-dependent colorimetric responses to various anions with different pKa values in high selectivity." @default.
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• W4386272007 date "2023-09-08" @default.
• W4386272007 modified "2023-10-17" @default.
• W4386272007 title "Narrow‐Pore Engineering of Vinylene‐Linked Covalent Organic Frameworks with Weak Interaction‐Triggered Multi‐Responses" @default.
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• W4386272007 doi "https://doi.org/10.1002/anie.202309125" @default.
• W4386272007 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37646743" @default.
• W4386272007 hasPublicationYear "2023" @default.
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