title: Electrocatalytic reduction of CO2 with palladium bis-N-heterocyclic carbene pincer complexes.
abstract: A series of pyridine- and lutidine-linked bis-N-heterocyclic carbene (NHC) palladium pincer complexes were electrochemically characterized and screened for CO2 reduction capability with 2,2,2-trifluoroethanol, acetic acid, or 2,2,2-trifluoroacetic acid (TFA) as proton sources. The lutidine-linked pincer complexes electrocatalytically reduce CO2 to CO at potentials as low as -1.6 V versus Ag/AgNO3 in the presence of TFA. The one-electron reduction of these complexes is shown to be chemically reversible, yielding a monometallic species, with density functional theory studies indicating charge storage on the redox-active ligand, thus addressing a major source of deactivation in earlier triphosphine electrocatalysts.
authors.affiliation: Department of Chemistry, University of British Columbia , Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Therrien
authors.forename: Michael O
authors.initials: MO
authors.lastname: Wolf
authors.forename: Brian O
authors.initials: BO
authors.lastname: Patrick