Reactivity of superoxide toward iron(II) complexes with pentadentate and hexadentate ligands derived from cyclononane

Abstract

The reactivity of superoxide toward two iron(II) complexes, one with the pentadentate ligand N,N'-di-2-picolyl4,7-diaza-1-oxacyclononane) (DPC) and the other with the hexadentate ligand N,N',N''tripicolyl-1,4,7-triazacyclononane) (TPC), has been examined using a range of electrochemical, spectroelectrochemical, and spectroscopic techniques. Repetitive cyclic voltammograms of both complexes indicate the formation of electrically conductive polymers on the electrode surface at negative potentials under aerobic conditions