Journal
DALTON TRANSACTIONS
Volume 42, Issue 42, Pages 15113-15119Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3dt51974k
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Funding
- CSIR
- DST, Govt. of India
- Deanship of Scientific Research at King Saud University [RGP VPP-207]
- Universiti Sains Malaysia (USM) [1002/PFIZIK/910323]
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A new fluorescent probe was synthesized from rhodamine-6G and 6-(hydroxymethyl) picolinohydrazide for the sensing of Fe3+ in an aqueous environment. The structure of the sensor was confirmed through its single crystal X-ray study. It exhibits a high specificity and sensitivity towards Fe3+ over other interfering heavy and transition metal ions (HTM). The turn-on greenish-yellow fluorescence and a colorimetric change from colourless to pink were observed upon addition of Fe3+ which evokes almost 116-and 23-fold enhancement in absorbance and emission intensity respectively in an acetonitrile-water (1:1, v/v, 25 degrees C) solution at a neutral pH (pH = 7.2). The Fe3+ promoted ring opening of the spirolactam framework to the open chain amide platform of the sensor is responsible for its visible colour change and turn-on fluorescence activity. It also exhibits an excellent performance in the dip stick method. Moreover the limit of detection of the probe is in the 10(-8) M range.
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