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Issue 11, 2008
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Selective sensing of competitive anions by non-selective hosts: the case of sulfate and phosphate in water

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Abstract

Two sensing ensembles based on the common squaramide host 2 and the acid–base indicators Cresol Red (CR) and Bromocresol Green (BG) are described. Both couples were characterized in EtOHH2O mixtures by UV-Vis spectroscopy. Analysis of the binding curves and the corresponding Job plots indicate 1 : 1 binding between the indicators CR or BG and host 2. The sensing solutions are responsive to sulfate and/or phosphate anions in water, changing the coloration of the solution. As in other indicator displacement assays (IDA), host 2 translates the chemical event into a colorimetric response that is analyzed by spectrophotometry. However, since other anions present in natural waters do not result in color changes, this method allows the quantification of sulfate and phosphate in water.

Graphical abstract: Selective sensing of competitive anions by non-selective hosts: the case of sulfate and phosphate in water

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Publication details

The article was received on 10 Jun 2008, accepted on 30 Jun 2008 and first published on 21 Aug 2008


Article type: Paper
DOI: 10.1039/B809454C
Citation: New J. Chem., 2008,32, 1919-1923
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    Selective sensing of competitive anions by non-selective hosts: the case of sulfate and phosphate in water

    M. N. Piña, B. Soberats, C. Rotger, P. Ballester, P. M. Deyà and A. Costa, New J. Chem., 2008, 32, 1919
    DOI: 10.1039/B809454C

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