Covalent organic framework film protected zinc anode for highly stable rechargeable aqueous zinc-ion batteries

Energy storage materials, Год журнала: 2022, Номер 48, С. 82 - 89

Опубликована: Март 1, 2022

Язык: Английский

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Metal–organic framework (MOF)-, covalent-organic framework (COF)-, and porous-organic polymers (POP)-catalyzed selective C–H bond activation and functionalization reactions

Chemical Society Reviews, Год журнала: 2022, Номер 51(18), С. 7810 - 7882

Опубликована: Янв. 1, 2022

Although C–H functionalization is one of the simplest reactions, it requires use highly active and selective catalysts. Recently, C–H-active transformations using porous materials such as crystalline metal-organic frameworks (MOFs) covalent-organic (COFs) well amorphous porous-organic polymers (POPs) new emerging heterogeneous catalysts have attracted significant attention due to their promising activity potential material tunability. These solids offer exceptional structural uniformity, facile tunability permanent porosity. In addition, tuning catalytic selectivity these can be achieved through engineering site microenvironments, metal node substitution, linker changes, node/linker functionalization, pore modification. The present review provides an overview current state art on MOFs, COFs POPs advanced for various bond activation providing details about chemo-, regio-, stereo-selectivity control, comparing performance with that other catalysts, triggering additional research by showing limitations challenges in this area, a perspective future developments.

Язык: Английский

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Engineering Covalent Organic Frameworks as Heterogeneous Photocatalysts for Organic Transformations

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(47)

Опубликована: Сен. 14, 2022

Abstract Covalent organic frameworks (COFs) are an emerging category of polymers with highly porous crystalline structures. In the last decade, reports on use COFs as heterogeneous photocatalysts for transformations have shown significant progress. Still, comprehensive reviews mechanisms photocatalytic using lacking. This Review provides a and systematic overview COF‐based transformations. Firstly, we discuss photophysical properties characterization methods photocatalysts. Then, general mechanism, advantages, strategies to improve efficiency summarized. After that, advanced examples analyzed regard underlying mechanisms. The ends critical perspective challenges prospects.

Язык: Английский

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Recent Advances in the Use of Covalent Organic Frameworks as Heterogenous Photocatalysts in Organic Synthesis

Advanced Materials, Год журнала: 2022, Номер 35(24)

Опубликована: Дек. 23, 2022

Abstract Organic photochemistry is intensely developed in the 1980s, which nature of excited electronic states and energy electron transfer processes are thoroughly studied finally well‐understood. This knowledge from molecular organic can be transferred to design covalent frameworks (COFs) as active visible‐light photocatalysts. COFs constitute a new class crystalline porous materials with substantial application potentials. Featured outstanding structural tunability, large porosity, high surface area, excellent stability, unique photoelectronic properties, potential candidates various research areas (e.g., photocatalysis). review aims provide state‐of‐the‐art insights into COF photocatalysts (pristine, functionalized, hybrid COFs) for transformations. The catalytic reaction mechanism COF‐based influence dimensionality crystallinity on heterogenous photocatalysis performance also discussed, followed by perspectives prospects main challenges opportunities future

Язык: Английский

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Acridine‐Functionalized Covalent Organic Frameworks (COFs) as Photocatalysts for Metallaphotocatalytic C−N Cross‐Coupling

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(21)

Опубликована: Фев. 21, 2022

Covalent organic frameworks (COFs) are structurally tuneable, porous and crystalline polymers constructed through the covalent attachment of small building blocks as elementary units. Using myriad such blocks, a broad spectrum functionalities has been applied for COF syntheses applications, including heterogeneous catalysis. Herein, we report synthesis new family COFs using novel acridine linker benzene-1,3,5-tricarbaldehyde derivatives bearing variable number hydroxy groups. With absorption in visible light region, were photocatalysts metallaphotocatalytic C-N cross-coupling. The fully β-ketoenamine linked showed highest activity, due to increased charge separation upon irradiation. good excellent yields several aryl bromides, recyclability even catalyzed transformation presence green energy source.

Язык: Английский

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Covalent Organic Frameworks as Emerging Platforms for CO₂ Photoreduction

ACS Catalysis, Год журнала: 2021, Номер 11(15), С. 9809 - 9824

Опубликована: Июль 20, 2021

Covalent organic frameworks (COFs) are an emerging class of porous crystalline materials consisting purely linking units stitched by strong covalent bonds to form extended with various networks and pore structures. Because the highly stacking layers, COFs adopt semiconductive properties exhibit promising catalytic performance in CO2 photoreduction. In this Perspective, we would like cast some light on photoreduction catalyzed COFs—emerging advanced photocatalytic platforms. Especially, direct our discussion linkages COFs, principles structural designs, viewpoints most recent advancements using (mainly two-dimensional structures) for This manuscript, therefore, acts as informative reference designing but not limited any kinds hybrid materials, suited CO2.

Язык: Английский

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Synthesis of Ionic Vinylene‐Linked Covalent Organic Frameworks through Quaternization‐Activated Knoevenagel Condensation

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(24), С. 13614 - 13620

Опубликована: Апрель 12, 2021

Abstract We developed a simple approach to synthesizing ionic vinylene‐linked two‐dimensional covalent organic frameworks (COFs) through quaternization‐promoted Knoevenagel condensation at three aromatic methyl carbon atoms of N ‐ethyl‐2,4,6‐trimethylpyridinium halide with multitopic aldehyde derivatives. The resultant COFs exhibited honeycomb‐like structure high crystallinity and surface areas as large 1343 m 2 g −1 . regular shape‐persistent nanochannels the positively charged polymeric allowed be uniformly composited linear polyethylene oxide lithium salt, displaying conductivity 2.72×10 −3 S cm

Язык: Английский

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Porous Dithiine-Linked Covalent Organic Framework as a Dynamic Platform for Covalent Polysulfide Anchoring in Lithium–Sulfur Battery Cathodes

Journal of the American Chemical Society, Год журнала: 2022, Номер 144(20), С. 9101 - 9112

Опубликована: Май 11, 2022

Dithiine linkage formation via a dynamic and self-correcting nucleophilic aromatic substitution reaction enables the de novo synthesis of porous thianthrene-based two-dimensional covalent organic framework (COF). For first time, this organo-sulfur moiety is integrated as structural building block into crystalline layered COF. The structure new material deviates from typical planar interlayer π-stacking COF to form undulated layers caused by bending along C-S-C bridge, without loss aromaticity crystallinity overall structure. Comprehensive experimental theoretical investigations model compound, featuring thianthrene moiety, suggest partial delocalization sulfur lone pair electrons over backbone decreasing band gap promoting redox activity. Postsynthetic sulfurization allows for direct attachment polysulfides carbon afford molecular-designed cathode lithium-sulfur (Li-S) batteries with minimized polysulfide shuttle. fabricated coin cell delivers nearly 77% initial capacity even after 500 charge-discharge cycles at mA/g current density. This novel in chemistry an ideal motif designing materials studying advanced electrode Li-S on molecular level.

Язык: Английский

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Porous organic materials for iodine adsorption

Journal of Hazardous Materials, Год журнала: 2023, Номер 458, С. 131835 - 131835

Опубликована: Июнь 12, 2023

Язык: Английский

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Ionic Covalent Organic Frameworks for Energy Devices

Advanced Materials, Год журнала: 2021, Номер 33(52)

Опубликована: Окт. 8, 2021

Covalent organic frameworks (COFs) are a class of porous crystalline materials whose facile preparation, functionality, and modularity have led to their becoming powerful platforms for the development molecular devices in many fields (bio)engineering, such as energy storage, environmental remediation, drug delivery, catalysis. In particular, ionic COFs (iCOFs) highly useful constructing devices, functional groups can transport ions efficiently, nonlabile ordered all-covalent pore structures backbones provide ideal pathways long-term under harsh electrochemical conditions. Here, current research progress on use iCOFs specifically lithium-based batteries fuel cells, is reviewed terms iCOF backbone-design strategies, synthetic approaches, properties, engineering techniques, applications. categorized anionic or cationic COFs, how each these types lithium ions, protons, hydroxides illustrated. Finally, challenges future opportunities utilization described. This review will therefore serve reference state-of-the-art design application strategies focusing devices.

Язык: Английский

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