A Series of Rare-Earth Metal-Based Coordination Polymers: Fluorescence and Sensing Studies
Ratiometric fluorescent sensing based on dual-emitting fluorescent coordination polymers (FL-CPs) has attracted intense attention due to their sensing accuracy and easy visualization when compared with sensing relying solely on monochromatic FL-CPs. In this work, a series of rare-earth metal-based C...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-10-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/24/21/6867 |
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| Summary: | Ratiometric fluorescent sensing based on dual-emitting fluorescent coordination polymers (FL-CPs) has attracted intense attention due to their sensing accuracy and easy visualization when compared with sensing relying solely on monochromatic FL-CPs. In this work, a series of rare-earth metal-based CPs, formuled as [(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>][Ln(bpdc)<sub>2</sub>] (Ln<sup>3+</sup> = Y<sup>3+</sup>, Eu<sup>3+</sup> and Tb<sup>3+</sup>, H<sub>2</sub>bpdc = biphenyl-4,4′-dicarboxylic acid), are presented, which show dual emission aroused from the Ln<sup>3+</sup> ions and the inefficient intermolecular energy transfer from ligands to Ln<sup>3+</sup> metals. For clarity, the as-made Ln-CPs are named Eu-bpdc, Tb-bpdc, and Y-bpdc based on the corresponding Ln<sup>3+</sup>. Notably, Eu-bpdc, presented as an example, could be used as FL sensing material ratiometric to Fe<sup>3+</sup> ions. The ratio of FL intensity of Eu<sup>3+</sup> ions to bpdc<sup>2−</sup> ligands (<i>I</i><sub>415</sub>/<i>I</i><sub>615</sub>) showed a good linear relationship with the concentrations of Fe<sup>3+</sup> ions. Moreover, the detection process could be visibly monitored through a change from purple to blue when Eu-bpdc was used as an FL proble. This work provides a good example for exploring visibly ratiometric sensors based on FL-CPs. |
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| ISSN: | 1424-8220 |