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Complexation of Palladium(II) with Unsaturated Dithioethers – A Systematic Development of Highly Selective Ligands for Solvent Extraction

Authors

  • Juliane Traeger,

    1. University of Potsdam, Institute of Chemistry, Department of Inorganic Chemistry, Karl-Liebknecht-Straße 24–25, 14476 Potsdam, Germany, Fax: +49-331-977-5055
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  • Tillmann Klamroth,

    1. University of Potsdam, Institute of Chemistry, Department of Theoretical Chemistry, Karl-Liebknecht-Straße 24–25, 14476 Potsdam, Germany
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  • Alexandra Kelling,

    1. University of Potsdam, Institute of Chemistry, Department of Inorganic Chemistry, Karl-Liebknecht-Straße 24–25, 14476 Potsdam, Germany, Fax: +49-331-977-5055
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  • Susanne Lubahn,

    1. University of Potsdam, Institute of Chemistry, Department of Inorganic Chemistry, Karl-Liebknecht-Straße 24–25, 14476 Potsdam, Germany, Fax: +49-331-977-5055
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  • Ernst Cleve,

    1. Hochschule Niederrhein, Institute for Coatings and Surface Chemistry, Frankenring 20, 47798 Krefeld, Germany
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  • Wulfhard Mickler,

    1. University of Potsdam, Institute of Chemistry, Department of Inorganic Chemistry, Karl-Liebknecht-Straße 24–25, 14476 Potsdam, Germany, Fax: +49-331-977-5055
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  • Matthias Heydenreich,

    1. University of Potsdam, Institute of Chemistry, Department of Analytical Chemistry, Karl-Liebknecht-Straße 24–25, 14476 Potsdam, Germany
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  • Holger Müller,

    1. University of Potsdam, Institute of Chemistry, Department of Inorganic Chemistry, Karl-Liebknecht-Straße 24–25, 14476 Potsdam, Germany, Fax: +49-331-977-5055
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  • Hans-Jürgen Holdt

    1. University of Potsdam, Institute of Chemistry, Department of Inorganic Chemistry, Karl-Liebknecht-Straße 24–25, 14476 Potsdam, Germany, Fax: +49-331-977-5055
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  • Patent application filed on August 22, 2011, EP11178303.1

Abstract

There is a demand for new and robust PdII extractants due to growing recycling rates. Chelating dithioethers are promising substances for solvent extraction as they form stable square-planar complexes with PdII. We have modified unsaturated dithioethers, which are known to coordinate PdII, and adapted them to the requirements of industrial practice. The ligands are analogues of 1,2-dithioethene with varying electron-withdrawing backbones and polar end-groups. The crystal structures of several ligands and their palladium complexes were determined as well as their electro- and photochemical properties, complex stability and behaviour in solution. Solvent extraction experiments showed the superiority of some of our ligands over conventionally used extractants in terms of their very fast reaction rates. With highly selective 1,2-bis(2-methoxyethylthio)benzene (4) it is possible to extract PdII from a highly acidic medium in the presence of other base and palladium-group metals.

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