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Sensors 2017, 17(9), 1980; doi:10.3390/s17091980

Fluorescent Polymer Incorporating Triazolyl Coumarin Units for Cu2+ Detection via Planarization of Ict-Based Fluorophore

Department of Chemistry, Nelson Mandela Metropolitan University, Port Elizabeth 6031, South Africa
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Received: 26 June 2017 / Revised: 28 July 2017 / Accepted: 4 August 2017 / Published: 30 August 2017
(This article belongs to the Special Issue Fluorescent Probes and Sensors)
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Abstract

A novel fluorescent polymer with pendant triazolyl coumarin units was synthesized through radical polymerization. The polymer showed reasonable sensitivity and selectivity towards Cu2+ in acetonitrile in comparison to other tested metal ions with a significant quenching effect on fluorescence and blue shifting in the range of 20 nm. The blue shift was assigned to the conformation changes of the diethylamino group from the coumarin moiety which led to planarization of the triazolyl coumarin units. The possible binding modes for Cu2+ towards the polymer were determined through the comparison of the emission responses of the polymer, starting vinyl monomer and reference compound, and the triazole ring was identified as one of the possible binding sites for Cu2+. The detection limits of the polymer and vinyl monomer towards Cu2+ were determined from fluorescence titration experiments and a higher sensitivity (35 times) was observed for the polymer compared with its starting monomer. View Full-Text
Keywords: pendant group; triazolyl coumarin; chemosensor; aggregate; planarization pendant group; triazolyl coumarin; chemosensor; aggregate; planarization
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MDPI and ACS Style

Ngororabanga, J.M.V.; Du Plessis, J.; Mama, N. Fluorescent Polymer Incorporating Triazolyl Coumarin Units for Cu2+ Detection via Planarization of Ict-Based Fluorophore. Sensors 2017, 17, 1980.

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