Electrochemical reduction of CO 2 to CO catalyzed by a bimetallic palladium complex

James W. Raebiger, Jeffrey W. Turner, Bruce C. Noll, Calvin J. Curtis, Alex Miedaner, Brian Cox, Daniel L. DuBois

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Abstract

The bis(triphosphine) ligand C 6H 4{P[CH 2CH 2CH 2P(C 6H 11) 2] 2} 2, m-(triphos) 2 (1), is synthesized by the reaction of m-bis(phosphino)benzene with 4 equiv of vinyldicyclohexylphosphine. Reaction of 1 with 2 equiv of [Pd(CH 3CN) 4](BF 4) 2 results in the formation of the bimetallic complex {m-(triphos) 2-[Pd(CH 3CN)] 2}(BF 4) 4 (2). A structural study of 2 confirms the presence of two [Pd(triphosphine)-(CH 3CN)] 2+ substituents at the meta positions of a benzene ring. Complex 2 catalyzes the electrochemical reduction of CO 2 to CO in acidic dimethylformamide solutions. The kinetics of this reaction have been studied, and the reaction is 0.5 order in catalyst and first order in CO 2. This catalyst exhibits catalytic rates comparable to that of its monometallic analogues. Significantly higher turnover numbers are observed for 2 than observed previously for monometallic, bimetallic, and dendritic complexes of this class of catalysts.

Original languageEnglish
Pages (from-to)3345-3351
Number of pages7
JournalOrganometallics
Volume25
Issue number14
DOIs
Publication statusPublished - Jul 3 2006

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

Raebiger, J. W., Turner, J. W., Noll, B. C., Curtis, C. J., Miedaner, A., Cox, B., & DuBois, D. L. (2006). Electrochemical reduction of CO 2 to CO catalyzed by a bimetallic palladium complex. Organometallics, 25(14), 3345-3351. https://doi.org/10.1021/om060228g