NHC Versus Pyridine: How “Teeth” Change the Redox Behavior of Iron(II) Complexes

Daniel T. Weiss, Markus R. Anneser, Stefan Haslinger, Alexander Pöthig, Mirza Cokoja, Jean-Marie Basset, Fritz E. Kühn

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


A series of octahedral iron(II) complexes with tetradentate NHC/pyridine hybrid ligands containing up to three pyridyl units was designed to study the influence of NHC and pyridine donors on the electronic structure of the metal center. Structural analysis of the iron complexes by NMR spectroscopy and single-crystal X-ray diffraction reveals different coordination modes of the ligand depending on the linkage of the different donor moieties. The oxidation potentials of all complexes correlate linearly with the number of NHC moieties coordinated to iron, as shown by cyclic voltammetry. The influence, although minor, of structural properties on the oxidation potential and (in one case) the influence of the oxidation state of the coordination geometry of the hybrid ligand are also demonstrated.
Original languageEnglish (US)
Pages (from-to)5155-5166
Number of pages12
Issue number20
StatePublished - Oct 6 2015


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