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

Klein, A.; Butsch, K.; Elmas, S.; Biewer, C.; Heift, D.; Nitsche, S.; Schlipf, I.; Bertagnolli, H.

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 (pydipH2).

Citation

Klein, A., Butsch, K., Elmas, S., Biewer, C., Heift, D., Nitsche, S., …Bertagnolli, H. (2012). Oxido-pincer complexes of copper(II) - An EXAFS and EPR study of mono- and binuclear [(pydotH)2CuCl2](n) (n=1 or 2). Polyhedron, 31(1), 649-656. https://doi.org/10.1016/j.poly.2011.10.023

• Journal Article Type: Article
• Acceptance Date: Oct 19, 2011
• Online Publication Date: Oct 28, 2011
• Publication Date: 2012-01
• Deposit Date: Feb 22, 2017
• Journal: Polyhedron
• Print ISSN: 0277-5387
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 31
• Issue: 1
• Pages: 649-656
• DOI: https://doi.org/10.1016/j.poly.2011.10.023
• Public URL: https://durham-repository.worktribe.com/output/1384972