Oxygen-Carrying Iridium Complexes: Kinetics, Mechanism, and Thermodynamics

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Science  05 Nov 1971:
Vol. 174, Issue 4009, pp. 587-589
DOI: 10.1126/science.174.4009.587


The rates of oxygenation and deoxygenation of a series of iridium complexes increase and decrease, respectively, with increasing electron-releasing tendency of the anionic ligands (A) attached to the metal atom in the oxygencarrying compounds, [IrA(CO)(Ph3P)2]. Calculated heats of oxygenation (—ΔH20), related to Ir-O2 bond energies, are proportional to the previously reported O-O bond lengths in the oxygen adducts, [O2IrA(CO)(Ph3P)2].