A Highly Selective and Sensitive Turn-On Fluorescent Chemosensor Based on Rhodamine 6G for Iron(III) |
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Authors: | Zhi-Qiang Hu Ying-Ying Gu Wen-Zhou Hu Lei-Li Sun Jiang-Hua Zhu Yi Jiang |
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Institution: | [a]College of Chemistry & Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042 (P. R. China), E-mail: , |
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Abstract: | Recently, more and more rhodamine derivatives have been used as fluorophores to construct sensors due to their excellent spectroscopic properties. A rhodamine-based fluorescent and colorimetric Fe3+ chemosensor 3’,6’-bis(ethylamino)-2-acetoxyl-2’,7’-dimethyl-spiro1H-isoindole-1,9’-9H]xanthen]-3(2H)-one (RAE) was designed and synthesized. Upon the addition of Fe3+, the dramatic enhancement of both fluorescence and absorbance intensity, as well as the color change of the solution, could be observed. The detection limit of RAE for Fe3+ was around 7.98 ppb. Common coexistent metal ions showed little or no interference in the detection of Fe3+. Moreover, the addition of CN− could quench the fluorescence of the acetonitrile solution of RAE and Fe3+, indicating the regeneration of the chemosensor RAE. The robust nature of the sensor was shown by the detection of Fe3+ even after repeated rounds of quenching. As iron is a ubiquitous metal in cells and plays vital roles in many biological processes, this chemosensor could be developed to have applications in biological studies. |
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Keywords: | chemosensors fluorescence iron(III) rhodamine selective response |
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