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Probing Physical Oxidation State by Resonant X‐ray Emission Spectroscopy: Applications to Iron Model Complexes and Nitrogenase
Author(s) -
Castillo Rebeca G.,
Hahn Anselm W.,
Van Kuiken Benjamin E.,
Henthorn Justin T.,
McGale Jeremy,
DeBeer Serena
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202015669
Subject(s) - valency , emission spectrum , oxidation state , ferrous , chemistry , electronic structure , spectroscopy , x ray absorption spectroscopy , mössbauer spectroscopy , atomic physics , metal , crystallography , spectral line , absorption spectroscopy , physics , computational chemistry , philosophy , linguistics , organic chemistry , quantum mechanics , astronomy
The ability of resonant X‐ray emission spectroscopy (XES) to recover physical oxidation state information, which may often be ambiguous in conventional X‐ray spectroscopy, is demonstrated. By combining Kβ XES with resonant excitation in the XAS pre‐edge region, resonant Kβ XES (or 1s3p RXES) data are obtained, which probe the 3d n +1 final‐state configuration. Comparison of the non‐resonant and resonant XES for a series of high‐spin ferrous and ferric complexes shows that oxidation state assignments that were previously unclear are now easily made. The present study spans iron tetrachlorides, iron sulfur clusters, and the MoFe protein of nitrogenase. While 1s3p RXES studies have previously been reported, to our knowledge, 1s3p RXES has not been previously utilized to resolve questions of metal valency in highly covalent systems. As such, the approach presented herein provides chemists with means to more rigorously and quantitatively address challenging electronic‐structure questions.