Journal
NEW JOURNAL OF CHEMISTRY
Volume 44, Issue 19, Pages 7954-7961Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj01273d
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Funding
- UGC, New Delhi, India [F.4-2/2006(BSR)/CH/17-18/0097]
- DST, Government of India [DST/INSPIRE/04/2016/001948]
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A chromogenic and off-on fluorogenic chemodosimeter (L) based on a naphthalene-rhodamine B derivative was designed, synthesized and characterized for the selective and sensitive detection of Au3+ ions in mixed acetonitrile aqueous medium in the presence of other competitive analytes. Probe L displayed a 696-fold turn-on fluorescence signal enhancement toward Au3+ ions with the detection limit of Au3+ of about 1.51 mu M. In the presence of Au3+ ions, probe L also exhibited a visible color change from colorless to pink that could be easily identified by the naked eye. This colorimetric and fluorometric changes were mainly due to the Au3+ ion-triggered imine bond (C=N) hydrolysis sensing mechanism. Moreover, theoretical calculations were performed to explain the experimental results. In addition to these features, the off-on probe was successfully used to monitor intracellular Au3+ ions in living MC3T3 cells through fluorescence imaging.
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