A Fluorescence Probe for “Turn-Off” Heavy-Metal-Ion Sensing – Synthesis and Characterization of a Dipyrromethene p-Phenylenevinylene Conjugated Copolymer and Its Electronic and Optical Properties

Joseph, A and Mathai, G and Schwandt, C and Ramamurthy, PC and Subramanian, S (2023) A Fluorescence Probe for “Turn-Off” Heavy-Metal-Ion Sensing – Synthesis and Characterization of a Dipyrromethene p-Phenylenevinylene Conjugated Copolymer and Its Electronic and Optical Properties. In: ChemistrySelect, 8 (13).

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Abstract

Fluorescent electroactive polymers possess good transduction properties and are used as active materials for sensors. Here, a fluorescent conjugated copolymer has been synthesized from dipyrromethane and p-phenylenevinylene as the monomers, and characterized for its optical and sensing properties. Absorption and emission analyses in various solvents have shown that the polymer exhibits excellent solvatochromism. A DFT method has been used to predict the bandgap as well as the electron distributions in HOMO and LUMO levels. The interaction of the polymer with selected metal ions has been studied in different solvents and the change in emission with concentration of the analyte has been determined. It has been observed that the polymer has a significant affinity towards Fe2+, Fe3+ and Co2+ ions with high Stern-Volmer quenching constants. Overall, this work has demonstrated that the polymer synthesized has a potential application as a heavy metal ion turn-off sensor.

Item Type:	Journal Article
Publication:	ChemistrySelect
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc.
Keywords:	Dipyrromethene; electroactive polymer; fluorescence; heavy metal sensing; metal chelation; quenching
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	28 May 2023 06:02
Last Modified:	28 May 2023 06:02
URI:	https://eprints.iisc.ac.in/id/eprint/81497

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