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Reactivity of metal hydrides with CO2: going beyond formate with a high-valent cationic pentahydride Mo(vi) complex
Nicolas Queyriaux1, Jorge J Cabrera-Trujillo2, Nina Durvin1
1LCC-CNRS, Université de Toulouse, CNRS, UPS 205 Route de Narbonne, BP44099 F-31077 Toulouse Cedex 4 France antoine.simonneau@lcc-toulouse.fr nicolas.queyriaux@lcc-toulouse.fr.
Abstract:
The cationic molybdenum pentahydride complex [MoH5(depe)2]+ (depe = 1,2-bis(diethylphosphino)ethane) is shown to undergo two consecutive reactions with carbon dioxide. In the initial, room-temperature process, classical insertion of CO2 into a metal-hydride bond is observed, resulting in the formation of the expected formate complex, [MoH2(HCOO)(depe)2]+. Further reactivity is triggered at temperature above 100 °C. Complete conversion into two new complexes is indeed observed, resulting from the formal cleavage of a C-O bond of carbon dioxide, [MoH(CO)2(depe)2]+ and [MoO(HCOO)(depe)2]+. Unprecedented in the absence of ligand assistance, such metal hydride reactivity has been comprehensively studied by a combination of experimental and computational means with the aim of elucidating the underlying mechanism that governs this process.
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