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Issue 9, 2000

A model system using modulation of lanthanide luminescence to signal Zn2+ in competitive aqueous media

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Abstract

Two pentadentate tribasic ligand systems containing aniline or benzylamine nitrogens covalently linked to a proximate kinetically stable Eu or Tb complex are described. The affinity of these complexes and their non-conjugated analogues for Zn2+, Ca2+ and Mg2+ ions has been measured at ambient pH in a high salt background. Apparent binding constants for the parent ligands (L1: Zn2+ log βML 5.04, Ca2+ 3.91, Mg2+ 2.1, L3: Zn2+ 5.93, Ca2+ 5.00, Mg2+ 3.60) were slightly lowered in the aniline-based terbium conjugate [TbL4], and were the same for the benzylamine-based conjugate [LnL2], except for zinc binding for which a slightly enhanced affinity was observed. Changes in the form of ligand absorption and emission spectra and in the intensity of delayed lanthanide luminescence characterised metal ion binding. With [LnL2], a 42 and 26% increase in emission at 700 nm (Eu) and 545 nm (Tb) accompanied zinc binding in a simulated extracellular background, with an apparent dissociation constant of 0.6 μM (295 K).

Supplementary files

Article information


Submitted
17 May 2000
Accepted
04 Jul 2000
First published
18 Aug 2000

J. Chem. Soc., Perkin Trans. 2, 2000, 1819-1831
Article type
Paper

A model system using modulation of lanthanide luminescence to signal Zn2+ in competitive aqueous media

O. Reany, T. Gunnlaugsson and D. Parker, J. Chem. Soc., Perkin Trans. 2, 2000, 1819 DOI: 10.1039/B003963M

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