Schiff Base Compounds as Fluorescent Probes for the Highly Sensitive and Selective Detection of Al<sup>3+</sup> Ions
Two new Schiff base fluorescent probes (L and S) were designed for selectively detecting Al<sup>3+</sup> ions in aqueous medium. Structural characterization of the purely synthesized compounds was acquired by IR, <sup>1</sup>H NMR and <sup>13</sup>C NMR. Moreover,...
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MDPI AG
2023-03-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/7/3090 |
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| author | Yanling Pang Desu Meng Jian Liu Shengxia Duan Jingru Fan Longyu Gao Xinshu Long |
| author_facet | Yanling Pang Desu Meng Jian Liu Shengxia Duan Jingru Fan Longyu Gao Xinshu Long |
| author_sort | Yanling Pang |
| collection | DOAJ |
| description | Two new Schiff base fluorescent probes (L and S) were designed for selectively detecting Al<sup>3+</sup> ions in aqueous medium. Structural characterization of the purely synthesized compounds was acquired by IR, <sup>1</sup>H NMR and <sup>13</sup>C NMR. Moreover, their photochromic and fluorescent behaviors have been investigated systematically by UV–Vis absorption and fluorescence spectra. The two probes have both high selectivity and sensitivity toward Al<sup>3+</sup> ions in aqueous medium. The 2:1 stoichiometry between the Al<sup>3+</sup> and probes was verified by Job’s plot. Moreover, the limits of detection (LOD) for Al<sup>3+</sup> by L and S were 1.98 × 10<sup>−8</sup> and 4.79 × 10<sup>−8</sup> mol/L, respectively, which was much lower than most previously reported probes. The possible recognition mechanism was that the metal ions would complex with Schiff base probes because of the prevalence of the species optimal for complex formation, inhibiting the structural isomerization of conjugated double bonds (-C=N-), inhibiting the proton transfer process in the excited state of the molecules and resulting in changes of its color and fluorescence behavior. Furthermore, the probes will have potential applications for selectively, detecting Al<sup>3+</sup> ions in the environmental system with high accuracy and providing a new strategy for the design and synthesis of multi-functional sensors. |
| first_indexed | 2024-03-11T05:29:56Z |
| format | Article |
| id | doaj.art-a337f73b17ff46ae922600b85e66dbf5 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T05:29:56Z |
| publishDate | 2023-03-01 |
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| record_format | Article |
| series | Molecules |
| spelling | doaj.art-a337f73b17ff46ae922600b85e66dbf52023-11-17T17:13:23ZengMDPI AGMolecules1420-30492023-03-01287309010.3390/molecules28073090Schiff Base Compounds as Fluorescent Probes for the Highly Sensitive and Selective Detection of Al<sup>3+</sup> IonsYanling Pang0Desu Meng1Jian Liu2Shengxia Duan3Jingru Fan4Longyu Gao5Xinshu Long6Department of Chemistry and Engineering, Heze University, Heze 274500, ChinaDepartment of Chemistry and Engineering, Heze University, Heze 274500, ChinaCollege of Agriculture and Bioengineering, Heze University, Heze 274000, ChinaDepartment of Chemistry and Engineering, Heze University, Heze 274500, ChinaDepartment of Chemistry and Engineering, Heze University, Heze 274500, ChinaDepartment of Chemistry and Engineering, Heze University, Heze 274500, ChinaDepartment of Chemistry and Engineering, Heze University, Heze 274500, ChinaTwo new Schiff base fluorescent probes (L and S) were designed for selectively detecting Al<sup>3+</sup> ions in aqueous medium. Structural characterization of the purely synthesized compounds was acquired by IR, <sup>1</sup>H NMR and <sup>13</sup>C NMR. Moreover, their photochromic and fluorescent behaviors have been investigated systematically by UV–Vis absorption and fluorescence spectra. The two probes have both high selectivity and sensitivity toward Al<sup>3+</sup> ions in aqueous medium. The 2:1 stoichiometry between the Al<sup>3+</sup> and probes was verified by Job’s plot. Moreover, the limits of detection (LOD) for Al<sup>3+</sup> by L and S were 1.98 × 10<sup>−8</sup> and 4.79 × 10<sup>−8</sup> mol/L, respectively, which was much lower than most previously reported probes. The possible recognition mechanism was that the metal ions would complex with Schiff base probes because of the prevalence of the species optimal for complex formation, inhibiting the structural isomerization of conjugated double bonds (-C=N-), inhibiting the proton transfer process in the excited state of the molecules and resulting in changes of its color and fluorescence behavior. Furthermore, the probes will have potential applications for selectively, detecting Al<sup>3+</sup> ions in the environmental system with high accuracy and providing a new strategy for the design and synthesis of multi-functional sensors.https://www.mdpi.com/1420-3049/28/7/3090Schiff baseAl<sup>3+</sup>fluorescent probecontent detection |
| spellingShingle | Yanling Pang Desu Meng Jian Liu Shengxia Duan Jingru Fan Longyu Gao Xinshu Long Schiff Base Compounds as Fluorescent Probes for the Highly Sensitive and Selective Detection of Al<sup>3+</sup> Ions Molecules Schiff base Al<sup>3+</sup> fluorescent probe content detection |
| title | Schiff Base Compounds as Fluorescent Probes for the Highly Sensitive and Selective Detection of Al<sup>3+</sup> Ions |
| title_full | Schiff Base Compounds as Fluorescent Probes for the Highly Sensitive and Selective Detection of Al<sup>3+</sup> Ions |
| title_fullStr | Schiff Base Compounds as Fluorescent Probes for the Highly Sensitive and Selective Detection of Al<sup>3+</sup> Ions |
| title_full_unstemmed | Schiff Base Compounds as Fluorescent Probes for the Highly Sensitive and Selective Detection of Al<sup>3+</sup> Ions |
| title_short | Schiff Base Compounds as Fluorescent Probes for the Highly Sensitive and Selective Detection of Al<sup>3+</sup> Ions |
| title_sort | schiff base compounds as fluorescent probes for the highly sensitive and selective detection of al sup 3 sup ions |
| topic | Schiff base Al<sup>3+</sup> fluorescent probe content detection |
| url | https://www.mdpi.com/1420-3049/28/7/3090 |
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