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Int. J. Mol. Sci. 2012, 13(12), 16822-16832; doi:10.3390/ijms131216822

Turn-On Fluorescent Chemosensor for Hg2+ Based on Multivalent Rhodamine Ligands

1 Laboratory of Molecular Nanofabrication, MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands 2 Department of Chemistry and Material Engineering, Logistic Engineering University, Chongqing 401311, China 3 Department of Chemistry, University of Sargodha, Punjab 40100, Pakistan
* Author to whom correspondence should be addressed.
Received: 22 November 2012 / Accepted: 4 December 2012 / Published: 7 December 2012
(This article belongs to the Special Issue Molecular Self-Assembly 2012)
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Rhodamine-based fluorescent chemosensors 1 and 2 exhibit selective fluorescence enhancement to Fe3+ and Hg2+ over other metal ions at 580 nm in CH3CN/H2O (3/1, v/v) solution. Bis(rhodamine) chemosensor 1, under optimized conditions (CH3CN/HEPES buffer (0.02 M, pH = 7.0) (95/5, v/v)), shows a high selectivity and sensitivity to Hg2+, with a linear working range of 0–50 μM, a wide pH span of 4–10, and a detection limit of 0.4 μM Hg2+.
Keywords: rhodamine; mercury; chemosensor; fluorescence rhodamine; mercury; chemosensor; fluorescence
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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Wang, X.; Iqbal, M.; Huskens, J.; Verboom, W. Turn-On Fluorescent Chemosensor for Hg2+ Based on Multivalent Rhodamine Ligands. Int. J. Mol. Sci. 2012, 13, 16822-16832.

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