Transition metal hydrides are important intermediates in a host of transformations, including hydrogenation, water splitting, and CO2 reduction. We report that visible light irradiation promotes hydride transfer from a pentamethylcyclopentadienyl-supported iridium hydride complex. Under illumination, the relatively unreactive iridium hydride undergoes dramatic rate acceleration in reactions with acids, releasing hydrogen, as well as in unique examples of photohydride transfer from a metal hydride to organic substrates, such as nicotinamide derivatives. Theoretical and experimental hydride donor abilities, hydricities, for the ground and excited states have been determined. The scope of photohydride reactivity will be discussed, including determination of excited state hydricity and mechanistic studies.

Excited state hydride transfer reactions of an organometallic iridium complex

248th National Meeting (2014)

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