Journal
NEW JOURNAL OF CHEMISTRY
Volume 45, Issue 48, Pages 22888-22901Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nj04286f
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Funding
- National Natural Science Foundation of China (NSFC) [41573106]
- China-Romania bilateral research collaboration project of the Ministry of Science and Technology of China [43-12]
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The study synthesized multi-component polymers with different functional groups, which are soluble, sensitive, and capable of sensing metal ions in aqueous environments.
Multi-component polymers (MCPs) incorporate multiple components into the main chain or pendant group and have special functions. In this work, the small-molecule fluorescent boron-dipyrromethene (BODIPY), with ester groups and/or alkoxyl long chains, was synthesized first. Then, this small-molecule BODIPY and the components containing C=C bonds (HD and PD) were reacted via the Heck coupling reaction to obtain macromolecuar probes that perform different functions. With the help of ester groups and alkoxyl tail, polymers MCP1 and MCP2 were soluble in a variety of water-miscible organic solvents. Moreover, MCP3 and MCP4 were completely soluble in water. These macromolecular probes showed sensitive and selective recognition toward Hg2+/Hg+ because of the introduced components (HD and PD) containing C=C bonds. After binding to Hg2+/Hg+, MCP1 and MCP2 demonstrated fluorescence quenching and color changes, which allowed the dual-channel specific detection of Hg2+/Hg+. Compared with the probes containing HD, the probes containing PD showed higher sensitivity, and the good recognition ability caused the detection limit to be as low as 0.32 mu M, which may be due to the molecular wire mechanism. The small-molecule components with different functional groups were polymerized into fluorescent polymer materials. This methodology endows the polymer probe with good solubility and high sensitivity, and the as-prepared polymers could sense metal ions in aqueous environments.
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