Designed Synthesis of Imine-Linked 2D Covalent Organic Frameworks with Enhanced Stability and Functionality DOI
Ting Chen,

W. Y. Jiao,

Wei-De Zhu

et al.

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(15), P. 7362 - 7369

Published: July 26, 2024

Covalent organic frameworks (COFs) linked by imine bonds have attracted significant attention, primarily due to the accessibility of monomers and facile synthesis highly crystalline materials. However, reversible nature raises stability concerns for these materials in practical applications. Therefore, there is a pressing need development imine-linked COFs that can combine high crystallinity, good stability, functionality. Here, adopting two-in-one molecular design strategy, we designed an building block containing both acetal amino connecting groups, featuring pyridine functional site, with side chains consisting alkoxyl groups. Following synthesis, elements were combined confined channel (0.85 nm), leading two-dimensional (2D) (COF-LIFM4 COF-LIFM5) crystallinity strong acid base conditions. Moreover, COF-LIFM5 exhibited favorable CO2 affinity appropriate hydrophobicity, making it promising modifier improving mass transfer reduction reaction (CO2RR). As result, Cu/COF-LIFM5 showcased enhanced C2+ product selectivity CO2RR, Faradaic efficiency exceeding 80% at current density 500 mA cm–2 flow cell.

Language: Английский

Covalent Organic Frameworks for Radioactive Iodine Capture: Structure and Functionality DOI
Jie Fu,

Jinyang Kang,

T. K. Kwei

et al.

Chemical Communications, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

This review identifies COFs as promising materials for radioactive iodine adsorption, and highlights how structural functional modifications, including electron-rich, flexible, ionic COF nanosheets significantly enhance capture.

Language: Английский

Citations

2
Nanoscale Covalent Organic Framework with Staggered Stacking of Phthalocyanines for Mitochondria-Targeted Photodynamic Therapy DOI
Jing Liu, Dong Won Kang, Yingjie Fan

et al.

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 146(1), P. 849 - 857

Published: Dec. 22, 2023

Phthalocyanine photosensitizers (PSs) have shown promise in fluorescence imaging and photodynamic therapy (PDT) of malignant tumors, but their practical application is limited by the aggregation-induced quenching (AIQ) inherent photobleaching PSs. Herein, we report synthesis a two-dimensional nanoscale covalent organic framework (nCOF) with staggered (AB) stacking zinc-phthalocyanines (ZnPc), ZnPc-PI, for mitochondria-targeted PDT. ZnPc-PI isolates confines ZnPc PSs rigid nCOF to reduce AIQ, improve photostability, enhance cellular uptake, increase level reactive oxygen species (ROS) generation via mitochondrial targeting. shows efficient tumor accumulation, which allowed precise nanoparticle tracking. With high uptake intrinsic targeting, enhanced ROS generation, exhibits potent PDT efficacy >95% growth inhibition on two murine colon cancer models without causing side effects.

Language: Английский

Citations

37
A Spirobifluorene-Based Covalent Organic Framework for Dual Photoredox and Nickel Catalysis DOI
Yingjie Fan, Dong Won Kang, Steven Labalme

et al.

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(46), P. 25074 - 25079

Published: Nov. 7, 2023

Covalent organic frameworks (COFs) have emerged as tunable, crystalline, and porous functional materials, but their application in photocatalysis has been limited by rapid excited-state quenching. Herein, we report the first example of dual photoredox/nickel catalysis an sp2 carbon-conjugated spirobifluorene-based COF. Constructed from spirobifluorene nickel-bipyridine linkers, NiSCN COF adopted a two-dimensional structure with staggered stacking. Under light irradiation, catalyzed amination etherification/esterification reactions aryl halides through photoredox mechanism, catalytic efficiency more than 23-fold higher that its homogeneous control. was used five consecutive without significant loss activity.

Language: Английский

Citations

36
Polycrystalline covalent organic frameworks DOI
Cheng Qian, Wei Liang Teo, Qiang Gao

et al.

Materials Today, Journal Year: 2023, Volume and Issue: 71, P. 91 - 107

Published: Nov. 23, 2023

Language: Английский

Citations

35
Thermally Induced Persistent Covalent-Organic Frameworks Radicals DOI
Qianfeng Gu,

Xiangqian Lu,

Cailing Chen

et al.

ACS Nano, Journal Year: 2023, Volume and Issue: 17(23), P. 23903 - 23912

Published: Nov. 28, 2023

Persistent covalent-organic framework (COF) radicals hold important applications in magnetics and spintronics; however, their facile synthesis remains a daunting challenge. Here, three p-phenylenediacetonitrile-based COFs (named CityU-4, CityU-5, CityU-6) were synthesized. Upon heat treatment (250 °C for CityU-4 CityU-5 or 220 CityU-6), these frameworks brought into persistent radical forms (no obvious changes after at least one year), together with several observable factors, including color changes, red-shifted absorption, the appearance of electron spin resonance (ESR) signals, detectable magnetic susceptibility. The theoretical simulation suggests that treatment, lower total energy nonzero density are two main factors to guarantee polarized distributions. This work provides an efficient method preparation COF promising potentials.

Language: Английский

Citations

27
Supramolecular channels via crown ether functionalized covalent organic frameworks for boosting polysulfides conversion in Li−S batteries DOI

Diandian Han,

Linhai Sun,

Ziqiu Li

et al.

Energy storage materials, Journal Year: 2023, Volume and Issue: 65, P. 103143 - 103143

Published: Dec. 17, 2023

Language: Английский

Citations

27
A Dithiin‐Linked Covalent Organic Polymer for Ultrahigh Capacity Half‐Cell and Symmetric Full‐Cell Sodium‐Ion Batteries DOI Creative Commons
Shen Xu, Chenchen Wang, Tianyi Song

et al.

Advanced Science, Journal Year: 2023, Volume and Issue: 10(32)

Published: Sept. 25, 2023

Abstract Sodium ion‐batteries (SIBs) are considered as a class of promising alternatives to lithium‐ion batteries (LIBs) overcome their drawbacks limited sources and safety problems. However, the lack high‐performance electrode materials hinders wide‐range commercialization SIBs. Comparing inorganic counterparts, organic materials, which benefitted from flexibly designable structures, low cost, environmental friendliness, high theoretical gravimetric capacities, should be prior choice. Here, covalent polymer (COP) based material (denoted CityU‐9) is designed synthesized by integrating multiple redox motifs (benzoquinone thioether), improved conductivity (sulfur induction), intrinsic insolubility (rigid skeleton). The half‐cell SIBs exhibit ultrahigh specific capacity 1009 mAh g −1 nearly no drop after 650 cycles. first all‐COP symmetric full‐cell shows 90 excellent rate capability. This work can extend selection redox‐active moieties provide rational design strategy novel materials.

Language: Английский

Citations

25
Tetrazine‐Linked Covalent Organic Frameworks With Acid Sensing and Photocatalytic Activity DOI
Amin Zadehnazari,

Ahmadreza Khosropour,

Ataf Ali Altaf

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(14)

Published: Dec. 23, 2023

Abstract The first synthesis and comprehensive characterization of two vinyl tetrazine‐linked covalent organic frameworks (COF), TA‐COF‐1 TA‐COF‐2, are reported. These materials exhibit high crystallinity specific surface areas 1323 1114 m 2 g −1 . COFs demonstrate favorable band positions narrow gaps suitable for light‐driven applications. advantages enable TA‐COFs to act as reusable metal‐free photocatalysts in the arylboronic acids oxidation light‐induced coupling benzylamines. In addition, these show acid sensing capabilities, exhibiting visible reversible color changes upon exposure HCl solution, vapor, NH 3 vapor. Further, outperform a wide range previously reported COF photocathodes. tetrazine linker skeleton represents significant advancement field synthesis, enhancing separation efficiency charge carriers during photoreaction contributing their photocathodic properties. can also degrade 5‐nitro‐1,2,4‐triazol‐3‐one (NTO), an insensitive explosive present industrial wastewater, 20 min sunlight‐driven photocatalytic process; thus, revealing dual functionality protonated both photodegradation Brønsted catalysts. This pioneering work opens new avenues harnessing potential COF‐based materials, facilitating advances catalysis, sensing, other related fields.

Language: Английский

Citations

25
Transparent, Self-Healing, and Defogging Wearable Devices Enabled by Plasmonic Silver Nanoparticle-Embedded Covalent–Organic Framework Nanosheets DOI
Guinan Chen,

Yuanyuan Lou,

Jiahao Li

et al.

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(2), P. 648 - 655

Published: Jan. 22, 2024

The development of transparent wearable devices capable self-healing and efficient fog removal is great significance. In this study, we have realized the fabrication a composite film exhibiting remarkable transparency along with light-triggered healing defogging capabilities. This was achieved by integrating plasmonic silver nanoparticle (AgNPs) embedded covalent–organic framework (COF) nanosheets, denoted as AgNPs/CONs, into waterborne elastic polyurethane (PU) matrix. Due to synergistic effect between AgNPs high properties COF nanosheets excellent photothermal characteristics, resulting film, even an ultralow loading AgNPs/CONs (0.15 wt %), demonstrate rapid temperature increase 80 °C upon exposure 500 mW cm–2 near-infrared (NIR) light irradiation for 12 s. Simultaneously, it maintains optical transmittance 96.2% at thin thickness 20 μm extremely low (0.08 %). localized elevation effectively eliminates surface promotes mechanical damage within achieving efficiency exceeding 98%. Our findings represent significant advancement in design photothermally active materials based on COFs, opening up new prospects next-generation electronic applications.

Language: Английский

Citations

13
Recent progress in covalent organic frameworks for flexible electronic devices DOI Creative Commons
Jinghang Wu, Shiwei Zhang,

Qianfeng Gu

et al.

FlexMat., Journal Year: 2024, Volume and Issue: 1(2), P. 160 - 172

Published: June 24, 2024

Abstract Covalent organic frameworks (COFs) are porous materials with good crystallinity, highly ordered stacking, tunable channels, and diverse functional groups that have been demonstrated to show great potential applications in flexible electronic devices, including energy storage devices (batteries supercapacitors), memristors sensors. Although research progress on the usage of COFs as active elements electronics has witnessed, summary this direction is rare. Thus, it right time write a review COFs‐based electronics. In review, we will first discuss different synthesis strategies prepare COF materials. Then, summarized. Finally, future performance improvement development directions field briefly outlined. This could provide basic concepts some guidelines stimulate novel devices.

Language: Английский

Citations

13