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

Mohit,

Kamal Kant Verma, Anupam Das

et al.

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

Insights into the Formation of Covalent Organic Frameworks by Probing Interfacial Water Structure using Vibrational Sum Frequency Generation Spectroscopy DOI Creative Commons
Ravindra Pandey,

Yogesh Kumar,

Srinivasa Rao Varanasi

et al.

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

Abstract Covalent organic frameworks (COFs) are an emerging class of porous materials with diverse applications across multiple fields. Most the ongoing research related to COFs predominantly focuses on developing new through novel linkers and innovative reactions, as well exploring their applications. A detailed molecular-level understanding COF synthesis is essential for advanced materials. The water structure adjacent can significantly influence design highly efficient heterogeneous catalysis, photocatalytic splitting, purification, aid in charge storage mechanism COF-based electrodes at electrode/electrolyte interfaces. To address this issue, we synthesized a 2D thin film via photon-assisted imine condensation water-air interface investigated process using vibrational sum frequency generation (VSFG) spectroscopy. We examined role catalyst, light, interfacial molecules COF. VSFG spectroscopy utilized successfully distinguish between amorphous crystalline films surface. Moreover, it was found that exhibits increased ordering stronger hydrogen bonding proximity

Language: Английский

Citations

0
Highly Conjugated Imine-Linked Donor–Acceptor Covalent Organic Framework for Efficient HCl Sensing and Photocatalytic Oxidation of Benzylamine DOI

Mohit,

Kamal Kant Verma, Anupam Das

et al.

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

Citations

0