Enhanced Dihydrogen Activation by Mononuclear Iridium(II) Compounds: A Mechanistic Study

The organometallic chemistry of 4d and 5d transition metals has been vastly dominated by closed-shell states. The reactivity of their metalloradical species is though remarkable, albeit yet poorly understood and with limited mechanistic investigations available. In this work we report the synthesis and characterization of two mononuclear Ir-II species, including the first dinitrogen adduct. These compounds activate dihydrogen at a dissimilar rate, in the latter case several orders of magnitude faster than its Ir-I precursor. A combined experimental/computational investigation to ascertain the mechanism of this transformation in Ir-II compounds is reported.

Automated summary

The organometallic chemistry of 4d and 5d transition metals has mainly focused on closed-shell states. Although the reactivity of their metalloradical species is remarkable, its mechanistic understanding is limited. This study presents the synthesis and characterization of two mononuclear Ir-II species, including the first dinitrogen adduct. Experimental and computational investigations are performed to elucidate the mechanism of this transformation in Ir-II compounds.