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

McMahon, B.K.; Parker, D.

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: Nov 20, 2014
• 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