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Mononuclear Iron Complexes with Tetraazadentate Ligands as Water Oxidation Catalysts
Author(s) -
Panchbhai Gayatri,
Singh Wangkheimayum Marjit,
Das Biswanath,
Jane Reuben T.,
Thapper Anders
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600165
Subject(s) - chemistry , catalysis , trifluoromethanesulfonate , cerium , reactivity (psychology) , aqueous solution , octahedron , octahedral molecular geometry , iridium , bipyridine , crystal structure , medicinal chemistry , inorganic chemistry , crystallography , organic chemistry , medicine , alternative medicine , pathology
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 Fe IV (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.