The synthetic molecular oxygen carrier O2IrCl(CO)(P[C 6H5]3)2, discovered by Vaska, has been characterized in a complete molecular structure determination. The structure surmised by Vaska from spectroscopic data has been confirmed and, in addition, definitive details on the attachment of molecular oxygen to iridium in this 1:1 reversible oxygen carrier have been obtained. The two oxygen atoms are equidistant from the metal atom, as in Griffith's model of the oxygen atoms in oxyhemoglobin. The O-O bond length of 1.30 ± 0.03 Å is intermediate between those characteristic of O2 (1.20 Å) and O 2 -2 (1.48 Å), and corresponds closely to O 2 - (1.28 Å).
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