Journal
CHEMISTRYOPEN
Volume 3, Issue 6, Pages 264-268Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/open.201402065
Keywords
chemosensors; fluorescence; iron(III); rhodamine; selective response
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Funding
- National Natural Science Foundation of China [21172127]
- National Natural Science Foundation of China for the Youth [21202180]
- Natural Science Foundation of Shandong Province, China [ZR2011M010]
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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-spiro[1H-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 7.98ppb. 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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