We demonstrate herein a newly designed benzothiadiazole-based covalent organic framework through an imine linkage with high crystallinity, excellent chemical stability and significant light ...absorption ability, which was further applied as a high-performance platform for efficient visible-light driven hydrogen evolution.
A benzothiadiazole-based covalent organic framework, which can be a high-performance platform for efficient visible-light driven hydrogen evolution, is reported.
A benzothiadiazole-involving donor-acceptor (D-A) covalent organic framework (COF), which has high crystallinity and strong light-harvesting capability (ranging from 300 to 800 nm), can serve as a ...highly effective photocatalyst for window ledge aerobic cross-dehydrogenative coupling (CDC) reactions (such as Mannich and aza-Henry reactions) even at a gram level.
A benzothiadiazole-involving donor-acceptor (D-A) COF, which can be a highly effective photocatalyst for window ledge aerobic cross-dehydrogenative coupling reactions, is reported.
Quinoline carboxylic acid-linked and Pd nanoparticle (NP)-loaded COF nanospheres were constructed
via
a three-component one-pot Doebner reaction and post-synthetic metalation. The obtained
...Pd@DhaTAPB-COOH
solid stabilizer can greatly promote the pH-switched recyclable Pickering interfacial dechlorination reaction, which sheds light on the bright future of smart Pickering emulsion catalysis.
A quinoline carboxylic acid-linked and Pd NP-loaded nanoscale covalent organic framework was constructed for the pH-switched recyclable Pickering interfacial catalytic dechlorination reaction.
A new composite Au@Cu(II)-MOF catalyst has been synthesized via solution impregnation and full characterized by HRTEM, SEM-EDS, XRD, gas adsorption–desorption, XPS, and ICP analysis. It has been ...shown here that the Cu(II)-framework can be a useful platform to stabilize and support gold nanoparticles (Au NPs). The obtained Au@Cu(II)-MOF exhibits a bifunctional catalytic behavior and is able to promote selective aerobic benzyl alcohol oxidation–Knoevenagel condensation in a stepwise way.
Two COFs (BT-COF1 and BT-COF2) with isomeric configuration were reported. Compared with BT-COF1, BT-COF2 with the narrower bandgap, smaller resistance and more evident charge transfer property ...exhibits superior catalytic performance in the photooxidation of sulfides.
Herein, a new Ag nanoparticle (Ag NP) loaded organic molecular cage is reported. The obtained Ag@1 can act as a highly efficient heterogeneous catalyst for the selective reduction of nitroarenes to ...azo compounds under visible-light irradiation.
A Pd nano particle (NP)-loaded and nano metal–organic framework (NMOF)-based Pickering emulsifier is reported. The poly2-(diethylamino)ethyl methacrylate) (PDEAEMA) chains were grafted onto ...UiO-66-type NPs via a postsynthetic approach to generate PDEAEMA- g -UiO-66 NMOF (termed as MOF-3). The Pd NPs-loaded Pd@MOF-3 was synthesized via solution impregnation. Stable toluene-in-water Pickering emulsion was prepared with emulsifier Pd@MOF-3. Notably, the obtained Pd@MOF-3 is pH-responsive, and it is able to trigger the emulsification (at neutral condition) and demulsification (at acidic condition) of toluene droplets. Furthermore, it can be a highly active interfacial catalyst to effectively promote one-pot Knoevenagel condensation–hydrogenation cascade reaction at ambient conditions. The pH-responsive property allowed it to be in situ separated and recycled by demulsifying via simply tuning the pH value at the end of the reaction. This smart Pickering emulsion catalytic system is robust, and it can be recycled at least five times without loss of its catalytic activity.
The catalytic asymmetric α-benzylation of aldehydes represents a highly valuable reaction for organic synthesis. For example, the generated α-heteroarylmethyl aldehydes, such as (
...)-2-methyl-3-(pyridin-4-yl)propanal ((
)-MPP), are an important class of synthons to access bioactive drugs and natural products. We report herein a new and facile synthetic approach for the asymmetric intermolecular α-benzylation of aldehydes with less sterically hindered alkyl halides using a multifunctional chiral covalent framework (CCOF) catalyst in a heterogeneous way. The integration of chiral BINOL-phosphoric acid and Cu(ii)-porphyrin modules into a single COF framework endows the obtained (
)-CuTAPBP-COF with concomitant Brønsted and Lewis acidic sites, robust chiral confinement space, and visible-light induced photothermal conversion. These features allow it to highly promote the intermolecular asymmetric α-benzylation of aldehydes
visible-light induced photothermal conversion. Notably, this light-induced thermally driven reaction can effectively proceed under natural sunlight irradiation. In addition, this reaction can be easily extended to a gram-scale level, and its generality is ascertained by asymmetric α-benzylation reactions on various substituted aldehydes and alkyl bromides.
As important personal protective equipment (PPE), face masks play a key role in self-protection during disastrous pandemics caused by the COVID-19 virus and other respiratory viruses. On the other ...hand, the massive utilization of disposable face masks creates big challenges not only in recycling and sterilizing the used face masks, but also in terms of plastic pollution and resource-saving. So, the development of self-sanitizing reusable face masks is highly imperative. We report herein a covalent organic framework (COF)-based face mask. In this regard, a Ag NP loaded and quinolinecarboxylic acid-linked nanoscale porphyrin COF composite of
Ag@DhaTph-COOH
is constructed by a three-component one-pot
in situ
Doebner reaction and sequential solution impregnation and NaBH
4
reduction. After mixing the hydroxyl-enriched COF NPs with isocyanate-terminated polyurethane oligomers, the obtained covalently cross-linked COF-dispersion is sprayed onto the outer layer of the non-woven PET fabric surface to yield a face mask with the deposited
Ag@DhaTph-COOH
NPs. Our face mask is reusable and exhibits solar-powered self-sanitizing ability with excellent antibacterial and antiviral performance
via
a triple-modal chemo/PDT/PTT synergistic treatment under natural sunlight irradiation.
A COF-based multifunctional reusable face mask, which exhibits solar-powered self-sanitizing ability with excellent antibacterial and antiviral performance
via
a triple-modal synergistic treatment, is reported.
Metal-free radiosensitizers, particularly iodine, have shown promise in enhancing radiotherapy due to their suitable X-ray absorption capacities and negligible biotoxicities. However, conventional ...iodine compounds have very short circulating half-lives and are not retained in tumors very well, which significantly limits their applications. Covalent organic frameworks (COFs) are highly biocompatible crystalline organic porous materials that are flourishing in nanomedicine but have not been developed for radiosensitization applications. Herein, we report the room-temperature synthesis of an iodide-containing cationic COF by the three-component one-pot reaction. The obtained
TDI-COF
can be a tumor radiosensitizer for enhanced radiotherapy by radiation-induced DNA double-strand breakage and lipid peroxidation and inhibits colorectal tumor growth by inducing ferroptosis. Our results highlight the excellent potential of metal-free COFs as radiotherapy sensitizers.
An iodide-containing cationic covalent organic framework as a nonmetallic radiosensitizer increases X-ray deposition and enhances radiotherapy of colon cancer
in vitro
and
in vivo
by inducing ferroptosis.
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