Henthorn JT, DeBeer S. Selenium Valence-to-Core X-ray Emission Spectroscopy and Kβ HERFD X-ray Absorption Spectroscopy as Complementary Probes of Chemical and Electronic Structure.
Inorg Chem 2022;
61:2760-2767. [PMID:
35113562 PMCID:
PMC8848279 DOI:
10.1021/acs.inorgchem.1c02802]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
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Selenium X-ray absorption
spectroscopy (XAS) has found widespread
use in investigations of Se-containing materials, geochemical processes,
and biologically active sites. In contrast to sulfur Kβ X-ray
emission spectroscopy (XES), which has been found to contain electronic
and structural information complementary to S XAS, Se Kβ XES
remains comparatively underexplored. Herein, we present the first
Se Valence-to-Core (VtC) XES studies of reduced Se-containing compounds
and FeSe dimers. Se VtC XES is found to be sensitive to changes in
covalent Se bonding interactions (Se–Se/Se–C/Se–H
bonding) while being relatively insensitive to changes in Fe oxidation
states as selenide bridges in FeSe dimers ([Fe2Se2]2+ vs [Fe2Se2]+). In
contrast, Se Kβ HERFD XAS is demonstrated to be quite sensitive
to changes in the Fe oxidation state with Se Kβ HERFD XAS demonstrating
experimental resolution equivalent to Kα HERFD XAS. Additionally,
computational studies reveal both Se VtC XES and XAS to be sensitive
to selenium protonation in FeSe complexes.
Selenium is a trace element that plays
vital roles in biological
and geochemical cycles, energy storage, photovoltaics, and nanomaterials.
Herein, selenium Valence-to-Core X-ray emission spectroscopy is explored
as a new method of probing the chemical and electronic structure in
selenium-containing compounds, demonstrating sensitivity to selenium
bonding interactions. When paired with high-resolution Se X-ray absorption
spectroscopy (HERFD XAS), these two methods have the potential to
reveal greater insight into protonation and redox changes of Se-substituted
FeS clusters.
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