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Infrared Spectroelectrochemistry of Iron-Nitrosyl Triarylcorroles. Implications for Ligand Noninnocence

Permanent link
https://hdl.handle.net/10037/24835
DOI
https://doi.org/10.1021/acs.inorgchem.9b03613
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Date
2020-02-13
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Author
Rahman, Md. Hafizur; Ryan, Michael D.; Vazquez-Lima, Hugo; Alemayehu, Abraham; Ghosh, Abhik
Abstract
Recent DFT calculations have suggested that iron nitrosyl triarylcorrole complexes have substantial {FeNO}7 −corrole•2− character. With this formulation, reduction of Fe(C)(NO) complexes, where C = triarylcorrole, should be centered on the corrole macrocycle rather than on the {FeNO}7 moiety. To verify this proposition, visible and infrared spectroelectrochemical studies of Fe(C)(NO) were carried out and the results were interpreted using DFT (B3LYP/STO-TZP) calculations. The first reduction of Fe(C)(NO) led to significant changes in the Soret and Q-band regions of the visible spectrum as well as to a significant downshift in the νNO and changes in the corrole vibrational frequencies. DFT calculations, which showed that the electron was mostly added to the corrole ligand (85%), were also able to predict the observed shifts in the νNO and corrole bands upon reduction. These results underscore the importance of monitoring both the corrole and nitrosyl vibrations in ascertaining the site of reduction. By contrast, the visible spectroelectrochemistry of the second reduction revealed only minor changes in the Soret band upon reduction, consistent with the reduction of the FeNO moiety.
Publisher
American chemical society
Citation
Rahman, Ryan, Vazquez-Lima H, Alemayehu A, Ghosh A. Infrared Spectroelectrochemistry of Iron-Nitrosyl Triarylcorroles. Implications for Ligand Noninnocence. Inorganic Chemistry. 2020;59:3232-3238
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Copyright 2020 American Chemical Society

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