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Issue 71, 2014
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Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling

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Abstract

Emission from a bright europium(III) complex, based on a 1,4,7-triazacyclononane ring bearing an alkyliminodiacetate group, is modulated only when in the presence of zinc(II) ions and a carboxylate anion and was characterised by ratiometric luminescence analysis at pH 7.4. No change in emission spectral form was observed when either the metal ion or oxy-anion was added separately. Amongst the diamagnetic systems examined, the strongest binding was observed for zinc and citrate (log K = 3.9, pH 7.4) and anion selectivity was observed in the order citrate > lactate/acetate/bicarbonate. No changes in the Eu spectral characteristics were found in the presence of added Ca2+ or Mg2+ ions, consistent with the much lower affinity of these cations for the iminodiacetate binding site.

Graphical abstract: Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling

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Publication details

The article was received on 19 Jun 2014, accepted on 11 Aug 2014 and first published on 11 Aug 2014


Article type: Paper
DOI: 10.1039/C4RA07894B
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Citation: RSC Adv., 2014,4, 37649-37654

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    Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling

    B. K. McMahon and D. Parker, RSC Adv., 2014, 4, 37649
    DOI: 10.1039/C4RA07894B

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