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CO 2 Capture by 2‐(Methylamino)pyridine Ligated Aluminum Alkyl Complexes
Author(s) -
Yokley Timothy W.,
Tupkar Hrishikesh,
Schley Nathan D.,
DeYonker Nathan J.,
Brewster Timothy P.
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000437
Subject(s) - chemistry , pyridine , alkyl , reactivity (psychology) , aluminium , carboxylate , lewis acids and bases , medicinal chemistry , stereochemistry , substrate (aquarium) , polymer chemistry , organic chemistry , catalysis , medicine , oceanography , alternative medicine , pathology , geology
A set of novel, easily synthesized aluminum complexes, Al[κ 2 ‐ N,N ‐2‐(methylamino)pyridine] 2 R (R = Et, i Bu) are reported. When subjected to 1 atm of CO 2 pressure, each hemilabile pyridine arm dissociates and facilitates cooperative activation of the CO 2 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 CO 2 per aluminum center. The ethyl variant then reacts further, inserting a third equivalent of CO 2 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.