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Cooperative or Oxidative Hydrogen Addition to 2‐Hydroxypyridonate Iridium Complexes: Dependence on Oxidation State
Author(s) -
Forrest Sebastian J. K.,
Manojveer Seetharaman,
Johnson Magnus T.
Publication year - 2017
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.201700534
Subject(s) - chemistry , iridium , reactivity (psychology) , ligand (biochemistry) , oxidative addition , denticity , oxidation state , chelation , redox , 2 pyridone , catalysis , metal , hydrogen , photochemistry , inorganic chemistry , combinatorial chemistry , medicinal chemistry , organic chemistry , medicine , biochemistry , alternative medicine , receptor , pathology
Iridium(III)–pyridone complexes are commonly found to react in a cooperative and redox‐neutral manner with dihydrogen and alcohols. In this work, the reactivity preferences of Ir I –pyridone complexes were investigated under a variety of conditions. We have found that, in contrast to Ir III –pyridones, Ir I –pyridone complexes display a strong preference to react non‐cooperatively. With a new chelating 2‐hydroxy‐8‐diphenylphosphinoquinoline ligand that does not dissociate after hydrogen addition, oxidative addition is still preferred. In the preparation of mono‐ and bidentate neutral and anionic pyridone ligands, Vaska's complex was used as a point of reference. We expect these findings to have implications for catalyst development in the field of metal–ligand cooperation.