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

Article

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

Xuemei Wang ^1,2 , Mudassir Iqbal ^1,3 , Jurriaan Huskens ¹  and Willem Verboom ^1,*

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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Abstract: 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

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