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

McMahon, B.K.; Parker, D.

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Authors

B.K. McMahon



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.

Citation

McMahon, B., & Parker, D. (2014). Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling. RSC Advances, 4(71), 37649-37654. https://doi.org/10.1039/c4ra07894b

Journal Article Type Article
Publication Date Aug 11, 2014
Deposit Date Nov 14, 2014
Publicly Available Date Mar 28, 2024
Journal RSC Advances
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 4
Issue 71
Pages 37649-37654
DOI https://doi.org/10.1039/c4ra07894b

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