Abstract
Two iron(II) complexes with tetraazadentate ligands have been synthesised, characterised and evaluated as water oxidation catalysts. The two ligands, N,N′‐diisopropyl‐N,N′‐bis(2‐pyridylmethyl)‐1,2‐diaminoethane (1), and N‐methyl‐N‐(2‐pyridinylmethyl)‐2,2′‐bipyridine‐6‐methanamine (2), both give iron(II) complexes (1Fe and 2Fe, respectively) with an octahedral coordination geometry with two labile triflate ligands in a cis configuration in the crystal structures. When treated with cerium(IV) as a chemical oxidant in aqueous solution at room temperature the complexes form semi‐stable FeIV(O) species that can be detected in the UV/Visible region. Both 1Fe and 2Fe can act as catalysts for water oxidation when treated with a large excess of oxidant, but 1Fe is a better catalyst than 2Fe. Possible geometrical factors behind this difference in reactivity are discussed and compared with literature data.
Published Version
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