Ultrafine Spatial Modulation of Diazapyrene-Based Two-Dimensional Conjugated Covalent Organic Frameworks

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(33), P. 23497 - 23507

Published: Aug. 8, 2024

Tailormade bottom-up synthesis of covalent organic frameworks (COFs) from various functional building blocks offer not only tunable topology and pore size but also multidimensional properties. High crystallinity is one the prerequisites for their structures associated physicochemical Among different π-conjugated motifs constructing COFs, pyrene-based tetragonal are effective in achieving highly ordered crystalline states. In present research, we demonstrated that substitution pyrene with 2,7-diazapyrene produces nearly "flat" two-dimensional (2D) COF layers by controlling torsional angle linker molecules. Featuring finite diameters excellent thermodynamic stability ∼500 °C, face-to-face (slipped AA) stacking arrangements were produced. Extended electrical conjugation spanning 2D frames modest optical bandgaps (Eg) ∼2.1 eV shows planar character diazapyrene-based COFs. The conjugated small Eg values beneficial formation stable conducting pathways state, which was confirmed results microwave conductivity measurements. Nitrogen centers diazapyrene units play a key role as active sites proton transfer, maximum σ = 10–2 S cm–1 achieved along cocontinuous nanopore surrounded sites. Results show COFs based on can be used material special proton-conducting capabilities.

Language: Английский

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Boosting the built-in electric field in heterojunctions of 2D and 3D systems to accelerate the separation and transfer of photogenerated carriers for efficient photocatalysis

FlatChem, Journal Year: 2024, Volume and Issue: 47, P. 100718 - 100718

Published: July 26, 2024

Language: Английский

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Isomerization of Covalent Organic Frameworks for Efficiently Activating Molecular Oxygen and Promoting Hydrogen Peroxide Photosynthesis

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Abstract Constitutional‐isomerized covalent organic frameworks (COFs), constructed by swapping monomers around imine bonds, have attracted attention for their distinct optoelectronic properties, which significantly impact photocatalytic performance. However, limited research has delved into the inherent relationship between isomerization and enhancement of H 2 O photosynthesis. Herein, a pair isomeric COFs linked bonds (PB‐PT‐COF PT‐PB‐COF) is synthesized, it proved that exhibit different rate‐determining steps in generation process , resulting twofold increase efficiency. Specifically, PT‐PB‐COF demonstrates effective adsorption activation molecular oxygen (O + e − → •O ), leading to significant improvement In contrast, PB‐PT‐COF exhibits robust interaction with O, enabling direct oxidation (H h ). This study provides thorough understanding intrinsic mechanism underlying constitutional‐isomerized generation, offering insights further optimizing building units.

Language: Английский

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Bifunctional hierarchical WO3 nanorods@Br-doped g-C3N4 Z-scheme heterojunctions for efficient tetracycline photodegradation: Optimization of key parameters, toxicological assessment, and electrocatalytic hydrogen evolution reaction

Environmental Research, Journal Year: 2025, Volume and Issue: 268, P. 120793 - 120793

Published: Jan. 9, 2025

Language: Английский

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Carbon Dots in Catalysis: Synthesis, Properties, Applications, Comparative Advantages, and Future Directions

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 115556 - 115556

Published: Jan. 1, 2025

Language: Английский

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A review on conductive polymers-modified TiO2 photocatalyst for environmental remediation

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 116518 - 116518

Published: April 1, 2025

Language: Английский

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Ni-doped cobalt selenide/sypress leaf CdS ohmic junction: An innovative strategy for efficient visible light hydrogen evolution

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 132953 - 132953

Published: April 1, 2025

Language: Английский

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Rolling two-dimensional covalent organic framework (COF) sheets into one-dimensional electronic and proton-conductive nanotubes

Proceedings of the National Academy of Sciences, Journal Year: 2025, Volume and Issue: 122(16)

Published: April 16, 2025

Mimicking the interconvertible carbon allotropes of 2-dimensional (2D) graphene and 1-dimensional (1D) nanotubes (CNTs), herein we report in situ transformation 2D π-conjugated covalent organic frameworks (COFs) sheet into 1D nanotubular structures via self-assembly sheets at solvent interfaces. The facile “roll-sheets” resulted coaxial with uniform cross-sectional diameter, which was realized for diazapyrene-based COFs but not corresponding pyrene COF, although both possess similar chemical structures. Upon replacing atoms 2,7-positions nitrogen, contrasting optical electronic properties were realized, reflecting rolled structure conjugated sheets. exhibited concerted electronic- proton-conducting nature stable conducting pathways ambient conditions. nitrogen centers act simultaneously as site charge carrier doping proton acceptors, evidenced by high photo- electrical conductivity, well record conductivity (σ = 1.98 S cm −1 ) results. present COF serves a unique materials platform conduction wall core, respectively.

Language: Английский

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Advances and Challenges in Multiple S-scheme Heterojunction Photocatalysts

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 180646 - 180646

Published: April 1, 2025

Language: Английский

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Single bond regulated 1O2 and ‧O2- selective generation of heptazine-based conjugated polymers for high-selectivity photocatalysis

Advanced Powder Materials, Journal Year: 2025, Volume and Issue: unknown, P. 100299 - 100299

Published: May 1, 2025

Language: Английский

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