"Electrocatalytic CO Reduction with Cis and Trans Conformers of a Rigid" by Weiwei Yang, Sayontani Sinha Roy et al.

Faculty Publications

Title

Electrocatalytic CO Reduction with Cis and Trans Conformers of a Rigid Dinuclear Rhenium Complex: Comparing the Monometallic and Cooperative Bimetallic Pathways

Authors

Weiwei Yang, Department of Chemistry and Biochemistry , University of Mississippi , University , Mississippi 38677 , United States.
Sayontani Sinha Roy, Department of Chemistry and Biochemistry , University of Mississippi , University , Mississippi 38677 , United States.
Winston C. Pitts, Department of Chemistry and Biochemistry , University of Mississippi , University , Mississippi 38677 , United States.
Rebekah L. Nelson, Department of Chemistry and Biochemistry , University of Mississippi , University , Mississippi 38677 , United States.
Frank R. Fronczek, Department of Chemistry , Louisiana State University , Baton Rouge , Louisiana 70803 , United States.
Jonah W. Jurss, Department of Chemistry and Biochemistry , University of Mississippi , University , Mississippi 38677 , United States.

Document Type

Article

Publication Date

8-6-2018

Abstract

Anthracene-bridged dinuclear rhenium complexes are reported for electrocatalytic carbon dioxide (CO) reduction to carbon monoxide (CO). Related by hindered rotation of each rhenium active site to either side of the anthracene bridge, cis and trans conformers have been isolated and characterized. Electrochemical studies reveal distinct mechanisms, whereby the cis conformer operates via cooperative bimetallic CO activation and conversion and the trans conformer reduces CO through well-established single-site and bimolecular pathways analogous to Re(bpy)(CO)Cl. Higher turnover frequencies are observed for the cis conformer (35.3 s) relative to the trans conformer (22.9 s), with both outperforming Re(bpy)(CO)Cl (11.1 s). Notably, at low applied potentials, the cis conformer does not catalyze the reductive disproportionation of CO to CO and CO in contrast to the trans conformer and mononuclear catalyst, demonstrating that the orientation of active sites and structure of the dinuclear cis complex dictate an alternative catalytic pathway. Further, UV-vis spectroelectrochemical experiments demonstrate that the anthracene bridge prevents intramolecular formation of a deactivated Re-Re-bonded dimer. Indeed, the cis conformer also avoids intermolecular Re-Re bond formation.

Publication Source (Journal or Book title)

Inorganic chemistry

First Page

9564

Last Page

9575

Recommended Citation

Yang, W., Sinha Roy, S., Pitts, W. C., Nelson, R. L., Fronczek, F. R., & Jurss, J. W. (2018). Electrocatalytic CO Reduction with Cis and Trans Conformers of a Rigid Dinuclear Rhenium Complex: Comparing the Monometallic and Cooperative Bimetallic Pathways. Inorganic chemistry, 57 (15), 9564-9575. https://doi.org/10.1021/acs.inorgchem.8b01775

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