Flexible Linker-Based Triazine-Functionalized 2D Covalent Organic Frameworks for Supercapacitor and Gas Sorption Applications

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(9), P. 11605 - 11616

Published: Feb. 26, 2024

Covalent organic frameworks (COFs) having a large surface area, porosity, and substantial amounts of heteroatom content are recognized as the ideal class materials for energy storage gas sorption applications. In this work, we have synthesized four different porous COF by polycondensation heteroatom-rich flexible triazine-based trialdehyde linker, namely 2,4,6-tris(4-formylphenoxy)-1,3,5-triazine (TPT-CHO), with triamine linkers. Triamine linkers were chosen based on differences in size, symmetry, planarity, content, leading to synthesis named IITR-COF-1, IITR-COF-2, IITR-COF-3, IITR-COF-4. within 24 h from most planar largest amine monomer, exhibited Brunauer-Emmett-Teller (BET) area 2830 m

Language: Английский

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Photocatalytic Applications of Covalent Organic Frameworks: Synthesis, Characterization, and Utility

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

Published: Jan. 1, 2024

This review highlights the recent advances in utilizing covalent organic frameworks (COFs) for photocatalytic applications.

Language: Английский

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Activation of Molecular Oxygen and Selective Oxidation with Metal Complexes

Accounts of Chemical Research, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 21, 2025

ConspectusSelective oxidation with molecular oxygen is one of the most appealing approaches to functionalization organic molecules and, yet at same time, challenging reactions facing synthesis due poor selectivity control. Molecular a green and inexpensive oxidant, producing water as only byproduct in oxidation. Not surprisingly, it has been used manufacturing many commodity chemicals industry. It also nature's choice oxidant drives variety critical life various other biologic processes. While past decades have witnessed great progress understanding, both structurally mechanistically, how nature exploits metalloenzymes, i.e., monooxygenases dioxygenases, tackle some reactions, e.g., methane methanol, there are small number well-defined, man-made metal complexes that reported enable selective compounds more relevant fine chemical pharmaceutical synthesis.In 10 years or so, our laboratories developed several transition shown they capable catalyzing under 1 atm O2. Thus, we an Fe(II)-bisimidazolidinyl-pyridine complex catalyzes oxygenation C–H bonds ethers concomitant release hydrogen gas instead water, when iron center replaced Fe(III), oxidative cleavage C═C olefins becomes feasible. To address low activity oxidizing less active olefins, Mn(II)-bipyridine complex, which aliphatic C–C diols, carboxyl units carboxylic acids visible light irradiation. Light necessary cleave off-cycle, inactive manganese dimer into catalytically Mn═O oxo species. Furthermore, found binuclear salicylate-bridged Cu(II) enables tetrahydroisoquinolines well bond cleavage, catalytic vitamin B1 analogue brought in, lactams takes place via carbene catalysis. Still further, readily accessible Rh(II)-terpyridine alcohols, being water-soluble, catalyst can be easily separated reused multiple times. In addition, recently unearthed simple protocol allows waste polystyrene depolymerized isolable, valuable chemicals. A cheap Brønsted acid acts catalyst, activating singlet state through complexation polymer irradiation, thereby depolymerizing polymer.

Language: Английский

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Highly Conjugated Imine-Linked Donor–Acceptor Covalent Organic Framework for Efficient HCl Sensing and Photocatalytic Oxidation of Benzylamine

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: April 9, 2025

Covalent organic frameworks (COFs) show potential as photocatalysts for harnessing solar energy, primarily because of their adjustable band gap, which enhances ability to harvest light energy. However, efficiency is frequently hampered by inadequate charge transfer and fast recombination. In this work, we integrated a donor-acceptor pair into the 2D COF material enhance reduce recombination, thereby improving overall photoactivity. The (OML-4) was synthesized through polycondensation 4',4‴,4‴″,4‴‴'-(ethene-1,1,2,2-tetrayl)tetrakis(([1,1'-biphenyl]-4-carbaldehyde)) (ETBC) linker serving donor 4,4',4″-(1,3,5-triazine-2,4,6-triyl)trianiline (TAPT) acting acceptor. This imine-linked shows photocatalytic activity toward benzylic amine oxidation in presence visible formation aldehyde molecules an aqueous medium. also investigated HCl gas sensing behavior based on protonation imine linkage triazine unit present material. exhibits exceptionally good sensitivity up ppm level naked eye detection changing color from yellow red turning back ammonia vapor, showing reversible recyclable nature COF.

Language: Английский

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Hydrazone‐Linked Donor‐Acceptor Covalent Organic Polymer as a Heterogeneous Photocatalyst for C‐S Bond Formation

Chemistry - A European Journal, Journal Year: 2024, Volume and Issue: unknown

Published: July 22, 2024

Abstract In the realm of solar energy utilization, there is a growing focus on designing and implementing effective photocatalytic systems, for conversion into valuable chemical fuels. The potential Covalent Organic Polymers (COPs) as photocatalysts visible‐light‐driven organic transformation has been widely investigated, positioning them promising candidates in this field. design COPs, introducing donor‐acceptor arrangement facilitates transfer electrons from donor to acceptor, creating charge complex leading enhanced conductivity improved separation. Here we present novel hydrazone‐linked covalent polymer ETBC‐PyHz containing TPE pyridine acceptor. Utilizing this, an efficient method developed oxidative cross‐coupling reaction involving C−S bond formation. This process involves arylhydrazines arenethiols, results production unsymmetrical diaryl sulfides via formation aryl thioarene radicals. holds significant importance because byproducts produced during are nitrogen water, making it environmentally benign.

Language: Английский

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New electrophiles targeting thiols in a reversible covalent manner

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(85), P. 12437 - 12440

Published: Jan. 1, 2024

Two electron-deficient olefins activated by amide and ester, amide-substituted acrylamide methyl ester-substituted acrylamide, targeting thiols in a reversible covalent manner were reported.

Language: Английский

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[2+2] Light-Driven Cycloaddition Synthesis of an Organic Polymer and Photocatalytic Activity Enhancement via Monomer Truncation

Published: Jan. 1, 2024

Language: Английский

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Cleavage of C=C Bond to form Carbonyl Compounds by a Donor–Acceptor COF Photocatalyst

Synfacts, Journal Year: 2023, Volume and Issue: 20(01), P. 0061 - 0061

Published: Dec. 8, 2023

Key words C=C bond cleavage - carbonyl compounds covalent organic frameworks photocatalysis

Language: Английский

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