Amino acid-functionalized polyfluorenes: A class of ultra-sensitive fluorescent sensors favoring Cr2O72-

¹ Flexible Electronics Innovation Institute and School of Pharmacy, Jiangxi Science & Technology Normal Uni-versity, Nanchang, Jiangxi 330013, China
² School of Chemistry and Chemical Engineering, Jiangxi Science & Technology Normal University, Nanchang 330013, China
³ Jiangxi Provincial Engineering Research Center for Waterborne Coatings, Nanchang 330013, China

Academic Editor: Nicole Jaffrezic-Renault

Published: 26 September 2023 by MDPI in The 2nd International Electronic Conference on Chemical Sensors and Analytical Chemistry session Electrochemical Devices and Sensors

https://doi.org/10.3390/CSAC2023-14909

Abstract:

Conjugated polymers (CPs) are an intriguing material to build fluorescent Cr₂O₇²^- sensors with excellent sensitivity but often lack specific recognition groups. In this study, several typical amino acids with N and O atom identifying groups were incorporated into fluorene and then six polyfluorene derivatives were synthesized using electrochemical polymerization. Compared to other cations and anions, all of these amino acid-functionalized polyfluorenes have good selectivity towards Cr₂O₇^2- and enable ultra-trace response with detection thresholds at pM or even fM level.

Keywords: Cr2O72-, conjugated polymer, polyfluorene; amino acid, fluorescent sensor

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