Redox Properties of Iron Complexes with Pentadentate Bispidine Ligands
Peter Comba A B , Hubert Wadepohl A and Arkadius Waleska A
+ Author Affiliations
- Author Affiliations
A Universität Heidelberg, Anorganisch-Chemisches Institut, INF 270, D-69120 Heidelberg, Germany.
B Corresponding author. Email: peter.comba@aci.uni-heidelberg.de
Australian Journal of Chemistry 67(3) 398-404 https://doi.org/10.1071/CH13454
Submitted: 30 August 2013 Accepted: 13 October 2013 Published: 21 November 2013
Abstract
The solution coordination chemistry of iron complexes with the pentadentate bispidine ligands L1, L2, and L3 (dimethyl 9-oxo-2,4-di(pyridin-2-yl)-3,7-diazabicyclo[3.3.1]nonane-1,5-dicarboxylate derivatives) was examined. While in acetonitrile, (L1,2)FeII/III species have a preference for Cl– as co-ligand. The corresponding aqua and hydroxido complexes also prevail in the presence of Cl– in aqueous solution. The observed FeII/III potentials in water (cyclic voltammetry) and potentials of (L1–3)FeIV=O (buffered and unbuffered aqueous solutions) are strikingly similar, i.e. the latter are assigned to (L1–3)FeII/III potentials, and published potentials of FeIV=O complexes with other ligands with uncharged amine-pyridine donors, obtained by cyclic voltammetry, have to be considered with caution.
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