Covalent Organic Frameworks as Porous Pigments for Photocatalytic Metal-Free C-H Borylation

Article Chemistry, Multidisciplinary

Microenvironments Enabled by Covalent Organic Framework Linkages for Modulating Active Metal Species in Photocatalytic CO2 Reduction

Shuailong Yang et al.

Summary: In this study, a nickel-modified COF was reported to enhance the photocatalytic reduction of CO2 by modifying the linkage microenvironment.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

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

Michael Traxler et al.

Summary: Covalent organic frameworks (COFs) are porous and crystalline polymers constructed through the covalent attachment of small organic building blocks. This study reports the synthesis of a new family of COFs using an acridine linker and benzene-1,3,5-tricarbaldehyde derivatives, and their application as photocatalysts in metallaphotocatalytic C-N cross-coupling reactions, exhibiting high activity and good yields.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Article Chemistry, Multidisciplinary

Nonplanar Rhombus and Kagome 2D Covalent Organic Frameworksfrom Distorted Aromatics for Electrical Conduction

Guolong Xing et al.

Summary: Covalent organic frameworks (COFs) are a new class of 2D materials with high crystallinity and tunable structures. However, their low electrical conductivity hinders their applications in electronics and optoelectronics. This study successfully designed and synthesized two different 2D COFs with different lattice structures and found that one of them exhibited high charge-carrier mobility.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Dual Metalation in a Two-Dimensional Covalent Organic Framework for Photocatalytic C-N Cross-Coupling Reactions

Ayan Jati et al.

Summary: This study presents a dual metalation strategy using a COF TpBpy for C-N cross-coupling reactions. The strategy demonstrates controlled metalation, recyclability, and visible-light-mediated catalysis. Experimental and theoretical studies provide insights into the catalyst and reaction mechanism.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Oxidation by Reduction: Efficient and Selective Oxidation of Alcohols by the Electrocatalytic Reduction of Peroxydisulfate

Seyyedamirhossein Hosseini et al.

Summary: In this study, a new electrochemical synthetic method called reductive oxidation is introduced, in which alcohol oxidation is initiated by the electrocatalytic reduction of peroxydisulfate. This approach provides a selective and mild method for the oxidation of alcohols to aldehydes, ketones, and carboxylic acids.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Triazine-Porphyrin-Based Hyperconjugated Covalent Organic Framework for High-Performance Photocatalysis

Xuxiao Liu et al.

Summary: Covalent organic frameworks (COFs) with porphyrins as structural units are a new type of porous organic polymers that exhibit regular structure, abundant porosity, and good stability. A new COF structure, TA-Por-sp(2)-COF, was constructed by linking porphyrin with the triazine ring through the self-polymerization of a cyano group-terminated porphyrin. The resulting highly ordered two-dimensional topological structure exhibited high photocatalytic performance in organic reactions.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Tunable Interlayer Shifting in Two-Dimensional Covalent Organic Frameworks Triggered by CO2 Sorption

Chengjun Kang et al.

Summary: In this study, an unusual step in the CO2 adsorption isotherm of a 2D covalent organic framework (COF), TAPB-OMeTA, was reported. The step was attributed to interlayer shifting caused by the interactions between the COF and CO2, which weakened the attraction between adjacent COF layers. The repulsion force between the methoxy groups on the COF backbone was found to be essential in facilitating the interlayer shifting process. This study demonstrates the tunability of interlayer shifting in 2D COFs and the potential for their use in gas storage and separation.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Multi-Component Synthesis of a Buta-1,3-diene-Linked Covalent Organic Framework

Yan Su et al.

Summary: This study presents a multi-component synthesis strategy for a two-dimensional crystalline covalent organic framework (COF), resulting in the formation of an unprecedented cyano-substituted buta-1,3diene-linked COF. The synthesized COF exhibits remarkable photoactivity and structural diversity, making it a potential efficient photocatalyst.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Natural Sunlight Photocatalytic Synthesis of Benzoxazole-Bridged Covalent Organic Framework for Photocatalysis

Cheng-Juan Wu et al.

Summary: This study reports the first-ever synthesis of COF using natural sunlight and demonstrates its application as a reusable photocatalyst for promoting light-driven oxidation reactions.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

A Visible-Light-Harvesting Covalent Organic Framework Bearing Single Nickel Sites as a Highly Efficient Sulfur-Carbon Cross-Coupling Dual Catalyst

Hui Chen et al.

Summary: This study explores a new COF material that combines photosensitivity and nickel catalytic activity to form a dual-functional catalyst. The catalyst shows excellent catalytic performance in the visible-light-driven catalytic sulfur-carbon cross-coupling reaction. This research demonstrates for the first time the use of a photosensitive COF scaffold and single transition metal sites as a two-component synergistic catalyst in organic transformation.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Covalent Organic Frameworks toward Diverse Photocatalytic Aerobic Oxidations

Shuyang Liu et al.

Summary: This study demonstrates the potential of photoactive two-dimensional covalent organic frameworks (2D-COFs) as heterogeneous photocatalysts in visible-light-driven organic transformations. Using 2D-COFs as the photocatalyst enables efficient oxidation of various small organic molecules under mild reaction conditions, leading to high yields and excellent functional group tolerance in the obtained products. Additionally, the inherent advantages of heterogeneous photocatalysis, sustainability, and easy recyclability of the photocatalyst were highlighted through selective and easy scale-up reactions to obtain specific drug molecules and simulant of oxidized mustard gas.

CHEMISTRY-A EUROPEAN JOURNAL (2021)

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Article Chemistry, Multidisciplinary

Heterogeneous C-H Functionalization in Water via Porous Covalent Organic Framework Nanofilms: A Case of Catalytic Sphere Transmutation

Himadri Sekhar Sasmal et al.

Summary: By designing and synthesizing solution-dispersible porous COF nanospheres, homogeneous catalysts have been converted into active heterogeneous catalysts operating in water with high catalytic yield and selectivity in functionalizing unactivated C-H bonds.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Multidisciplinary Sciences

A radical approach for the selective C-H borylation of azines

Ji Hye Kim et al.

Summary: A new strategy for the borylation of azines has been developed, utilizing stable and inexpensive amine-borane reagents in conjunction with photocatalysis. This approach allows for selective borylation of nitrogen-containing aromatic heterocycles through the formation of highly reactive boryl radicals, providing an alternative tactic for sp(2) carbon-boron bond assembly. The strong nucleophilic character of the amine-boryl radicals enables predictable and site-selective carbon-boron bond formation in azine structures, leading to the preparation of borylated materials that are otherwise difficult to access.

NATURE (2021)

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Article Chemistry, Physical

Photoredox Heterobimetallic Dual Catalysis Using Engineered Covalent Organic Frameworks

Alberto Lopez-Magano et al.

Summary: The functionalization of an imine-based layered covalent organic framework has allowed the obtention of a heterobimetallated material with photoactive Ir and Ni fragments immobilized within the porous structure. These heterogeneous light-mediated reactions showed enhanced activity and stability compared to analogous homogeneous systems.

ACS CATALYSIS (2021)

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Article Chemistry, Multidisciplinary