Oxido-pincer complexes of copper (II): an EXAFS and EPR study of mono- and binuclear [(pydotH2) CuCl2] n (n= 1 or 2)

Axel Klein, Katharina Butsch, Sait Elmas, Christian Biewer, Dominikus Heift, Sara Nitsche, Irene Schlipf, Helmut Bertagnolli

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    The oxido-pincer ligand pydotH2 (2,6-bis(1-hydroxy-1-o-tolyl- ethyl-η2O,O′)pyridine) forms two different CuII containing complexes when prepared from anhydrous CuCl2. A combination of EPR spectroscopy and EXAFS allowed to structurally characterise the light-green dimer of the formula [(pydotH2)CuCl(μ-Cl) 2ClCu(pydotH2)] and the penta-coordinate olive-green monomer [(pydotH2)CuCl2]. The molecular entities imply that the ligand remains protonated upon coordination. When dissolved in DMF both compounds form monomeric species [(pydotH2)CuCl2(DMF)] which could be characterised in detail by EPR, UV-Vis/NIR spectroscopy and electrochemical measurements. The assignments were supported by comparison with CuII complexes of the related ligands 2,6-bis(hydroxymethyl)pyridine (pydimH2) and 2,6-bis(1-hydroxy-1-methyl)pyridine (pydipH 2).

    Original languageEnglish
    Pages (from-to)649-656
    Number of pages8
    JournalPOLYHEDRON
    Volume31
    Issue number1
    DOIs
    Publication statusPublished - 4 Jan 2012

    Keywords

    • oxido-pincer ligand
    • copper
    • EPR spectroscopy
    • coordination geometry

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