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Complexation of Palladium(II) with Unsaturated Dithioethers – A Systematic Development of Highly Selective Ligands for Solvent Extraction
Author(s) -
Traeger Juliane,
Klamroth Tillmann,
Kelling Alexandra,
Lubahn Susanne,
Cleve Ernst,
Mickler Wulfhard,
Heydenreich Matthias,
Müller Holger,
Holdt HansJürgen
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201101406
Subject(s) - chemistry , palladium , solvent , chelation , extraction (chemistry) , benzene , solvent extraction , ligand (biochemistry) , combinatorial chemistry , inorganic chemistry , organic chemistry , catalysis , biochemistry , receptor
There is a demand for new and robust Pd II extractants due to growing recycling rates. Chelating dithioethers are promising substances for solvent extraction as they form stable square‐planar complexes with Pd II . We have modified unsaturated dithioethers, which are known to coordinate Pd II , 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 Pd II from a highly acidic medium in the presence of other base and palladium‐group metals.