Four-co-ordinate iridium(I) cations and the ligand dependence of oxygen uptake: the crystal structure of [Ir(PPh2CH3)4]BF4

Abstract

Four-co-ordinate iridium(I) cations containing various combinations of the ligands, CO, MeCN, Me₂SO, PPh₃, PPh₂Me, and PPh₂Et are described including an X-ray structural analysis of [Ir(PPh₂Me)₄]BF₄: the ability of these cations to co-ordinate oxygen is found to be sensitive to steric factors.