Open AccessA Highly Selective and Sensitive Turn‐On Fluorescent Chemosensor Based on Rhodamine 6G for Iron(III)
Author(s) -
Hu Zhi-Qiang,
Gu Ying-Ying,
Hu Wen-Zhou,
Sun Lei-Li,
Zhu Jiang-Hua,
Jiang Yi
Publication year - 2014
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.201402065
Subject(s) - fluorescence , chemistry , photochemistry , rhodamine 6g , rhodamine , absorbance , detection limit , metal ions in aqueous solution , quenching (fluorescence) , acetonitrile , metal , organic chemistry , chromatography , molecule , physics , quantum mechanics
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 Fe 3+ chemosensor 3’,6’‐bis(ethylamino)‐2‐acetoxyl‐2’,7’‐dimethyl‐spiro[1 H ‐isoindole‐1,9’‐[9 H ]xanthen]‐3(2 H )‐one ( RAE ) was designed and synthesized. Upon the addition of Fe 3+ , 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 Fe 3+ was around 7.98 ppb. Common coexistent metal ions showed little or no interference in the detection of Fe 3+ . Moreover, the addition of CN − could quench the fluorescence of the acetonitrile solution of RAE and Fe 3+ , indicating the regeneration of the chemosensor RAE . The robust nature of the sensor was shown by the detection of Fe 3+ 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.