Second Coordination Sphere Effect Shifts CO 2 to CO Reduction by Iron Porphyrin from Fe 0 to Fe I - I2BC Access content directly
Journal Articles Angewandte Chemie International Edition Year : 2024

Second Coordination Sphere Effect Shifts CO 2 to CO Reduction by Iron Porphyrin from Fe 0 to Fe I

Abstract

Iron porphyrins are among the most studied molecular catalysts for carbon dioxide (CO 2 ) reduction and their reactivity is constantly being enhanced through the implementation of chemical functionalities in the second coordination sphere inspired by the active sites of enzymes. In this study, we were intrigued to observe that a multipoint hydrogen bonding scheme provided by embarked urea groups could also shift the redox activation step of CO 2 from the well‐admitted Fe(0) to the Fe(I) state. Using EPR, resonance Raman, IR and UV‐Visible spectroscopies, we underpinned a two‐electron activation step of CO 2 starting from the Fe(I) oxidation state to form, after protonation, an Fe(III)−COOH species. The addition of another electron and a proton to the latter species converged to the cleavage of a C−O bond with the loss of water molecule resulting in an Fe(II)−CO species. DFT analyses of these postulated intermediates are in good agreement with our collected spectroscopic data, allowing us to propose an alternative pathway in the catalytic CO 2 reduction with iron porphyrin catalyst. Such a remarkable shift opens new lines of research in the design of molecular catalysts to reach low overpotentials in performing multi‐electronic CO 2 reduction catalysis.
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Dates and versions

hal-04441669 , version 1 (06-02-2024)

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Sk Amanullah, Philipp Gotico, Marie Sircoglou, Winfried Leibl, Manuel Llansola-Portoles, et al.. Second Coordination Sphere Effect Shifts CO 2 to CO Reduction by Iron Porphyrin from Fe 0 to Fe I. Angewandte Chemie International Edition, 2024, 63 (4), pp.e202314439. ⟨10.1002/anie.202314439⟩. ⟨hal-04441669⟩
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