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Coordination-Induced Emissive Poly-NHC-Derived Metallacage for Pesticide Detection

Maitra, PK and Bhattacharyya, S and Purba, PC and Mukherjee, PS (2023) Coordination-Induced Emissive Poly-NHC-Derived Metallacage for Pesticide Detection. In: Inorganic Chemistry .

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Official URL: https://doi.org/10.1021/acs.inorgchem.3c03759


Developing sensitive, rapid, and convenient methods for the detection of residual toxic pesticides is immensely important to prevent irreversible damage to the human body. Luminescent metal-organic cages and macrocycles have shown great applications, and designing highly emissive supramolecular systems in dilute solution using metal-ligand coordination-driven self-assembly is demanded. In this study, we have demonstrated the development of a silver-carbene bond directed tetranuclear silver(I)-octacarbene metallacage Ag4(L)2(PF6)4 (1) based on an aggregation-induced emissive (AIE) cored 1,1�,1�,1�-((1,4-phenylenebis(ethene-2,1,1-triyl))tetrakis(benzene-4,1-diyl))tetrakis(3-methyl-1H-imidazol-3-ium) salt (L). A 36-fold enhanced emission was observed after metallacage (1) formation when compared with the ligand (L) in dilute solution due to the restriction of intramolecular motions imparted by metal-ligand coordination. Such an increase in fluorescence made 1 a potential candidate for the detection of a broad-spectrum pesticide, 2,6-dichloro-nitroaniline (DCN). 1 was able to detect DCN efficiently by the fluorescence quenching method with a significant detection limit (1.64 ppm). A combination of static and dynamic quenching was applicable depending on the analyte concentration. The use of silver-carbene bond directed self-assembly to exploit coordination-induced emission as an alternative to AIE in dilute solution and then apply this approach to solve health and safety concerns is noteworthy and carries a lot of potential for future developments. © 2024 American Chemical Society

Item Type: Journal Article
Publication: Inorganic Chemistry
Publisher: American Chemical Society
Additional Information: The copyright for this article belongs to Author.
Keywords: Damage detection; Fluorescence; Ligands; Organometallics; Pesticides; Quenching, Dilute solution; Human bodies; Irreversible damage; Ligand coordination; Metal ligands; Nitroanilines; Pesticide detection; Silver carbenes; Tetrakis; Toxic pesticides, Silver compounds
Department/Centre: Others
Date Deposited: 01 Mar 2024 10:04
Last Modified: 01 Mar 2024 10:04
URI: https://eprints.iisc.ac.in/id/eprint/84036

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