A New Polymer-Based Fluorescent Chemosensor Incorporating Propane-1,3-Dione and 2,5-Diethynylbenzene Moieties for Detection of Copper(II) and Iron(III).

Dongliang Yang,Lianhui Wang,Zhimin Luo,Yixiang Cheng,Shuli Liu,Lixing Weng,Yanling Hu,Chunhui Dai

doi:10.3390/polym9070267

Dongliang Yang, Lianhui Wang + Show 6 more

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https://doi.org/10.3390/polym9070267

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Abstract

A novel conjugated polymer (PDBDBM) was developed by the polymerization of 1,4-dioctyloxy-2,5-diethynylbenzene with 1,3-bis(4-bromophenyl)propane-1,3-dione based on Pd-catalyzed Sonogashira-coupling reaction. The obtained polymer PDBDBM exhibited bright green photoluminescence under UV irradiation. According to the metal ion titration experiments, PDBDBM showed high sensitivity and selectivity for detection of Cu2+ and Fe3+ over other metal ions. The fluorescent detection limits of PDBDBM were calculated to be 5 nM for Cu2+ and 0.4 μM for Fe3+ and the Stern–Volmer quenching constant for Cu2+ and Fe3+ were found to be 1.28 × 108 M−1 and 2.40 × 104 M−1, respectively. These results indicated that the polymer can be used as a potential probe for Cu2+ and Fe3+ detection.

Highlights

All organisms have absolute requirements for a series of metals as they play critical role in biological processes [1]
PDBDBM was synthesized from M1 and M2 by Pd-catalyzed
To further purify the conjugated polymer PDBDBM, the product was washed with methanol and collected as a solid power in 70% yield

Summary

Introduction

All organisms have absolute requirements for a series of metals as they play critical role in biological processes [1]. An essential trace metal, participates in a variety of fundamental physiological processes, such as redox processes and enzyme-catalyzed reactions [2]. Cu2+ homeostasis could lead to numerous diseases, including amyotrophic lateral sclerosis, Parkinson’s disease, Alzheimer’s disease, Menkes disease, and neurodegenerative diseases [2,3]. As the second most abundant trace metal element, is involved in many physiological events such as oxygen transport, DNA synthesis, and electron transport [3,4]. Iron deficiency is associated with disorders such as anemia, hemochromatosis, and Alzheimer’s [5]. Numerous efforts have been made to develop selective and sensitive detection methods for Cu2+ and Fe3+ , including UV–Vis [8], fluorescence [4], atomic absorption spectra [9], and electrochemical methods [10]

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