Chem, Journal Year: 2025, Volume and Issue: unknown, P. 102398 - 102398
Published: Feb. 1, 2025
Language: Английский
Science, Journal Year: 2024, Volume and Issue: 386(6722), P. 693 - 696
Published: Nov. 7, 2024
Developing porous materials with ultrahigh surface areas for gas storage (for example, methane) is attractive but challenging. Here, we report two isostructural three-dimensional covalent organic frameworks (COFs) a rare self-catenated
Language: Английский
Citations
38
Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(29), P. 19643 - 19648
Published: July 11, 2024
We report 9 crystal structures of a two-dimensional (2D) covalent organic framework (COF), including the parent Py-1P, 5 derivatives formed by chemical reactions, and 3 dynamic states solvent exchange/loss. Structure details these porous crystals, stacking mode, interlayer distance, pore aperture, incline angle, before, during, after conversion processes in solution, were unveiled single-crystal X-ray diffraction with resolutions up to 0.85 Å. The structure evolution is triggered stepwise conformational transformation molecular building blocks 2D COF, while their long-range ordering remained unsacrificed.
Language: Английский
Citations
24
Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 2, 2025
Furthering the field of synthetic organic chemistry from discrete molecules regime to extended structure regime, covalent frameworks (COFs) represent a new genre crystalline porous materials featuring designability with molecular-level precision, well-defined porosity, and exceptional stability imparted by robust linkages reticulating molecules. The topology COFs is principal feature that regulates their functionality usability for emerging technologies. Profound comprehension network topologies maneuvering them toward targeted applications are crucial advancing realm COF research developing novel functional exciting breakthroughs. In this Perspective, we discuss recent pursuits contributing discovery highly connected nets having topologies, assess key challenges achieving such offer insights into current scenario future directions.
Language: Английский
Citations
6
Nature Synthesis, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 14, 2025
Language: Английский
Citations
5
Energy storage materials, Journal Year: 2025, Volume and Issue: unknown, P. 104052 - 104052
Published: Jan. 1, 2025
Language: Английский
Citations
5
Nature Chemistry, Journal Year: 2025, Volume and Issue: 17(2), P. 226 - 232
Published: Jan. 6, 2025
Language: Английский
Citations
4
Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(31), P. 21989 - 21998
Published: July 26, 2024
The creation of uniformly molecular-sized through-pores within polymeric membranes and the direct evidence these pores are essential for fundamentally understanding transport mechanism improving separation efficiency. Herein, we report an electric-field-assisted interface synthesis approach to fabricating large-area covalent organic framework (COF) that consist preferentially oriented single-crystalline COF domains. These frameworks were translated into high-density, vertically aligned across entire membrane, enabling visualization membrane with ultrahigh resolution 2 Å using low-dose high-resolution transmission electron microscopy technique (HRTEM). density directly visualized was quantified be 1.2 × 10
Language: Английский
Citations
18
Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(42), P. 28932 - 28940
Published: Oct. 11, 2024
Single-crystalline covalent organic frameworks (COFs) are highly desirable toward understanding their pore chemistry and functions. Herein, two 50–100 μm single-crystalline three-dimensional (3D) COFs, TAM-TFPB-COF TAPB-TFS-COF, were prepared from the condensation of 4,4′,4″,4‴-methanetetrayltetraaniline (TAM) with 3,3′,5,5′-tetrakis(4-formylphenyl)bimesityl (TFPB) 3,3′,5,5′-tetrakis(4-aminophenyl)bimesityl (TAPB) 4,4′,4″,4‴-silanetetrayltetrabenzaldehyde (TFS), respectively, in 1,4-dioxane under catalysis acetic acid. Single-crystal 3D electron diffraction reveals triply interpenetrated dia-b networks atom resolution, while isostructure TAPB-TFS-COF was disclosed by synchrotron single-crystal X-ray powder Le Bail refinements. The nitrogen sorption measurements at 77 K disclose microporosity nature both activated COFs exceptionally high Brunauer–Emmett–Teller surface areas 3533 4107 m2 g–1, representing thus far record specific area among imine-bonded COFs. This enables to exhibit also methane uptake capacities up 28.9 wt % (570 cm3 g–1) 25 °C 200 bar all reported far. work not only presents structures exceptional but provides an example engineering adjust permanent microporous for storage.
Language: Английский
Citations
18
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(33)
Published: April 1, 2024
Abstract Solvothermal synthesis is the predominant method for creating new structured covalent organic frameworks (COFs), yet it grapples with challenges in controlling shape and morphology. This issue attributed to unregulated solvent‐feeding process, which results rapid polymerization uncontrolled phase separation. Consequently, a two‐step process reported solvothermal shaping of imine‐linked COF monoliths hierarchical porosity. The conditions powders existing literature are directly utilized without extensive optimization; however, solvents divided into two segments prior feeding. A minor segment employed dissolve monomers, polymerize situ form amorphous monoliths. Subsequently, remaining solvent, along an acetic acid aqueous solution, added crystallization. versatility this feeding producing illustrated. high‐quality demonstrate benzene uptakes ranging from 6.0 16.8 mmol g −1 at 298 K. study confirms that solvent can be effectively integrated conventional enhance solution‐processability COFs. It anticipated modified approach readily COFs meet practical application requirements.
Language: Английский
Citations
14
Advanced Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 27, 2024
Abstract Photocatalysis leverages solar energy to overcome the thermodynamic barrier, enabling efficient chemical reactions under mild conditions. It can greatly reduce reliance on traditional sources and has attracted significant research interest. Reticular materials, including metal‐organic frameworks (MOFs) covalent organic (COFs), represent a class of crystalline materials constructed from molecular building blocks linked by coordination bonds, respectively. function as heterogeneous catalysts, combining well‐defined structures high tailorability akin homogeneous catalysts. In this review, regulation light absorption, charge separation, surface in photocatalytic process through precise molecular‐level design based features reticular is elaborated. Notably, for MOFsmicroenvironment modulation around catalytic sites affects performance delved, with emphasis their unique dynamic flexible microenvironments. For COFs, inherent excitonic effects due fully nature discussed highlight strategies regulate charge‐ and/or energy‐transfer‐mediated photocatalysis. Finally, current challenges future directions field, aiming provide comprehensive understanding how be optimized enhanced photocatalysis discussed.
Language: Английский
Citations
11