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Durham Research Online
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Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling.

McMahon, B.K. and Parker, D. (2014) 'Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling.', RSC advances., 4 (71). pp. 37649-37654.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1039/C4RA07894B
Date accepted:No date available
Date deposited:20 November 2014
Date of first online publication:August 2014
Date first made open access:No date available

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