Ligand-Based Reduction of CO2 to CO Mediated by an Anionic Niobium Nitride Complex
Author(s)Silvia, Jared Scott; Cummins, Christopher C.
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The terminal nitride anion complex [Na][N≡Nb(N[tBu]Ar)3] ([Na], Ar = 3,5-Me2C6H3) reacts quantitatively with CO2 to give the carbamate complex [Na][O2CN≡Nb(N[tBu]Ar)3] ([Na][O2C-1]). The structure of [Na][O2C-1] as the bis-12-crown-4 solvate, as determined by X-ray crystallography, displays a unique N-bound carbamate ligand without any metal−oxygen interactions. When treated with organic acid anhydrides or acid chlorides, complex [Na][O2C-1] reacts via salt elimination to give the five-coordinate complexes (RC(O)O)(OCN)Nb(N[tBu]Ar)3 (R-2, R = Me, tBu, F3C). We show that complexes R-2 yield the starting complex [Na] with concomitant release of CO upon two-electron reduction. This series of reactions constitutes a closed cycle for the conversion of CO2 to CO mediated by a terminal nitride anion complex.
DepartmentMassachusetts Institute of Technology. Department of Chemistry
Journal of the American Chemical Society
American Chemical Society
Silvia, Jared S., and Christopher C. Cummins. “Ligand-Based Reduction of CO2 to CO Mediated by an Anionic Niobium Nitride Complex.” Journal of the American Chemical Society 132.7 (2010) : 2169-2171.
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