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In this experiment, students examine the kinetics by which molecular oxygen deactivates the electronically excited triplet states of the polycyclic aromatic hydrocarbon phenanthrene in hexane solution.

Reaction of silanes (HSiR,, R, = Me,Ph, (OMe),) with trans-MeIr(CO)[P(p-tolyl),], leads to methane and Hlr(SiR,),(CO)[P(p-tolyl),], through oxidative addition and reductive elimination sequences. These reactions contrast with those involving the addition of silanes to analogous alkoxo iridium complexes. Reaction of Me,SiI with rrans-MeIr(CO)[P@-tolyl),], produces Me. $ and Ir(SiMe,)(CO)[P(p-tolyl),],I,, thus providing the first example of oxidative addition of silicon-iodide bonds at ambient conditions. These reactions demonstrate the formation of carbon-hydrogen and silicon-carbon bonds.