CO2 Capture by 2-(Methylamino)pyridine Ligated Aluminum Alkyl Complexes
A set of novel, easily synthesized aluminum complexes, Al[κ2-N,N-2-(methylamino)pyridine]2R (R = Et, iBu) are reported. When subjected to 1 atm of CO2 pressure, each hemilabile pyridine arm dissociates and facilitates cooperative activation of the CO2 substrate reminiscent of a Frustrated Lewis Pair. This reaction has limited precedent for Al/N based Lewis Pair systems, and this is the first system readily shown to sequester multiple equivalents of CO2 per aluminum center. The ethyl variant then reacts further, inserting a third equivalent of CO2 into the aluminum alkyl to generate an aluminum carboxylate. Examples of this type of reactivity are rare under thermal conditions. A joint experimental/computational study supports the proposed reaction mechanism.
European Journal of Inorganic Chemistry
Yokley, T., Tupkar, H., Schley, N., DeYonker, N., & Brewster, T. (2020). CO2 Capture by 2-(Methylamino)pyridine Ligated Aluminum Alkyl Complexes. European Journal of Inorganic Chemistry, 2020 (31), 2958-2967. https://doi.org/10.1002/ejic.202000437