O<sub>2</sub> Activation by Metal–Ligand Cooperation
with Ir<sup>I</sup> PNP Pincer Complexes
- Publication date
- Publisher
Abstract
A unique
mode of molecular oxygen activation, involving metal–ligand
cooperation, is described. Ir pincer complexes [(<sup>t</sup>BuPNP)Ir(R)]
(R = C<sub>6</sub>H<sub>5</sub> (<b>1</b>), CH<sub>2</sub>COCH<sub>3</sub> (<b>2</b>)) react with O<sub>2</sub> to form the dearomatized
hydroxo complexes [(<sup>t</sup>BuPNP*)Ir(R)(OH)] (<sup>t</sup>BuPNP* = deprotonated <sup>t</sup>BuPNP ligand), in a process which
utilizes both O-atoms. Experimental evidence, including NMR, EPR,
and mass analyses, indicates a binuclear mechanism involving an O-atom
transfer by a peroxo intermediate
