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Stability constants of complexes formed by new Schiff-base lariat ethers derived from 4,13-diaza-18-crown-6 with Ag+, Pb2+, Cu2+ cations determined by competitive potentiometry

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Abstract

The stability of complexes formed by a series of Schiff-base lariat ethers, derived from 4,13-diaza-18-crown-6, 1 with Ag+, Pb2+, Cu2+ cations, has been comparatively determined, in methanol: dichloromethane solution. We present here the synthesis and an interesting competitive potentiometry method useful for the stability constant determination for a new family of Schiff-base bibracchial lariat ethers. The stability constants and the selectivity in competitive complexation of Ag+, Pb2+ and Cu2+ cations by macrocyclic receptors 1–7 (L), can be accurately evaluated and species distribution diagrams can be calculated for individual system. In all cases further functionalization of bibracchial lariat ethers 2–7 is accompanied by an increasing of the selectivity, relative to the complexes of the initial 4,13-diaza-18-crown-6 macrocycle 1.

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Acknowledgements

This work, conducted as part of the award “Dynamic Adaptative Materials for Separation and Sensing Microsystems” made under the European Heads of Research Councils and European Science Foundation EURYI (European Young Investigator) Awards scheme in 2004, was supported by funds from the Participating Organisations of EURYI and the EC Sixth Framework Programme. See http://www.esf.org/euryi

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Authors and Affiliations

  1. Analytical Chemistry and Instrumental Analysis Department, Faculty of Applied Chemistry and Material Science, University “Politehnica” Bucharest, Gh. Polizu.1, Bucharest, 011061, Romania

    Aurelia Tar & Constantin Luca

  2. Institut Européen des Membranes, Place Eugen Bataillon CC047, Montpellier, Cedex 5, 34095, France

    Mihail Barboiu & Yves-Marie Legrand

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  1. Aurelia Tar
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  2. Mihail Barboiu
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Correspondence to Mihail Barboiu.

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Tar, A., Barboiu, M., Legrand, YM. et al. Stability constants of complexes formed by new Schiff-base lariat ethers derived from 4,13-diaza-18-crown-6 with Ag+, Pb2+, Cu2+ cations determined by competitive potentiometry. J Incl Phenom Macrocycl Chem 60, 35–41 (2008). https://doi.org/10.1007/s10847-007-9349-5

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