As highly versatile crystalline porous materials, covalent organic frameworks (COFs) have emerged as an ideal platform for developing novel functional materials, attributed to their precise tunability of structure and functionality. Introducing chiral functional units into frameworks produces chiral COFs (CCOFs) with chiral superiorities through chirality conservation and conversion processes. This review summarises recent research progress in CCOFs, including synthetic methods, chiroptical characterisations, and their applications in asymmetric catalysis, chiral separation, and enantioselective recognition and sensing. Challenges and limitations are discussed to uncover future opportunities in CCOF research.
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http://dx.doi.org/10.1039/d2sc02436e | DOI Listing |
ACS Nano
January 2025
Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, College of Materials Science and Engineering, Hunan University, Changsha 410082, China.
SiO-based anodes, considered the most promising candidate for high-energy density batteries, have long been bothered by mechanical integrity issues. Research efforts focus on particle modifications, often overlooking the enhancement of interparticle connections, which can reduce the active material content within the electrode. Herein, an integrated electrode with strong covalent bonding at the electrode scale is designed, achieving excellent mechanical stability with ∼95 wt.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.
Furthering the field of synthetic organic chemistry from the discrete molecules regime to the extended structure regime, covalent organic frameworks (COFs) represent a new genre of crystalline porous materials featuring designability with molecular-level precision, well-defined porosity, and exceptional stability imparted by the robust covalent linkages reticulating organic molecules. The topology of COFs is a principal feature that regulates their functionality and usability for emerging technologies. Profound comprehension of network topologies and maneuvering them toward targeted applications are crucial to advancing the realm of COF research and developing novel functional materials for exciting breakthroughs.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Humboldt-Universität zu Berlin, Department of Chemistry, Laboratory of Organic Chemistry and Functional Materials, Brook-Taylor-Str. 2, 12489, Berlin, GERMANY.
Here we disclose that spiropyrans are able to undergo dynamic covalent exchange via their corresponding merocyanine isomers. In the latter, the indolinium moieties can be exchanged by a Michael-type addition-elimination sequence, in which a methylene indoline attacks a merocyanine and subsequently the initial indoline fragment is cleaved. The rate and position of the exchange equilibrium strongly depend on the reaction conditions as well as the substitution pattern on the methylene indoline fragments.
View Article and Find Full Text PDFSmall
January 2025
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Covalent organic frameworks (COFs) are a promising platform for heterogeneous photocatalysis due to their stability and design diversity, but their potential is often restricted by unmanageable targeted excitation and charge transfer. Herein, a bimetallic COF integrating photosensitizers and catalytic sites is designed to facilitate locally ultrafast charge transfer, aiming to improve the photocatalytic reduction of CO. The strategy uses a "one-pot" method to synthesize the bimetallic COF (termed PBCOF) through in situ Schiff-base condensation of Pyrene with MBpy (M = Ru, Re) units.
View Article and Find Full Text PDFSmall
January 2025
Centre for Nanotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India.
To rival commercial organic electrolytes, it is important to focus on safe, cheap aqueous electrolytes with lower salt concentration (≈5.0 m) and a wider electrochemical stable potential window (ESPW). This study reports the facile synthesis of porphyrin-based covalent organic polymers (PTZ-COP, CBZ-COP, and TPA-COP) through a one-pot aromatic electrophilic polycondensation reaction between pyrrole and monomeric aldehydes (PTZ-CHO, CBZ-CHO and TPA-CHO).
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