Synthesis and X-ray structure of a mixed oxidation state tetrameric molybdenum(III,IV) complex di-µ-oxo-bis[µ-oxo-µ-hydroxo-µ(NN′)ethylenediaminetetra-acetatomolybdate(III,IV)]

1976 ◽  
pp. 523-524 ◽  
Author(s):  
Takashi Shibahara ◽  
Bernard Sheldrick ◽  
A. Geoffrey Sykes
Keyword(s):  
Oxidation State ◽  
X Ray ◽  
Mixed Oxidation

scholarly journals DetOx: a program for determining anomalous scattering factors of mixed-oxidation-state species

2012 ◽  
Vol 20 (1) ◽  
pp. 200-204 ◽  
Author(s):  
Karim J. Sutton ◽  
Sarah A. Barnett ◽  
Kirsten E. Christensen ◽  
Harriott Nowell ◽  
Amber L. Thompson ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Oxidation State ◽  
Diffraction Data ◽  
Oxidation States ◽  
Anomalous Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mixed Oxidation ◽  
X Ray Absorption ◽  
Absorption Edges

Overlapping absorption edges will occur when an element is present in multiple oxidation states within a material.DetOxis a program for partitioning overlapping X-ray absorption spectra into contributions from individual atomic species and computing the dependence of the anomalous scattering factors on X-ray energy. It is demonstrated how these results can be used in combination with X-ray diffraction data to determine the oxidation state of ions at specific sites in a mixed-valance material, GaCl2.

scholarly journals Probing physical oxidation state via resonant X‐ray emission spectroscopy: Applications to iron model complexes and nitrogenase

2021 ◽  
Author(s):  
Serena DeBeer ◽  
Rebeca G. Castillo ◽  
Anselm W. Hahn ◽  
Benjamin E. Van Kuiken ◽  
Justin T. Henthorn
Keyword(s):  
Oxidation State ◽  
Emission Spectroscopy ◽  
Model Complexes ◽  
X Ray

scholarly journals Changes of Pd Oxidation State in Pd/Al2O3 Catalysts Using Modulated Excitation DRIFTS

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 116
Author(s):  
Gian Luca Chiarello ◽  
Ye Lu ◽  
Miren Agote-Arán ◽  
Riccardo Pellegrini ◽  
Davide Ferri
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Oxidation State ◽  
Diffuse Reflectance ◽  
X Ray ◽  
Spectral Changes ◽  
Diffuse Reflectance Infrared ◽  
X Ray Absorption ◽  
Reversible Reduction

Infrared spectroscopy is typically not used to establish the oxidation state of metal-based catalysts. In this work, we show that the baseline of spectra collected in diffuse reflectance mode of a series of Pd/Al2O3 samples of increasing Pd content varies significantly and reversibly under alternate pulses of CO or H2 and O2. Moreover, these baseline changes are proportional to the Pd content in Pd/Al2O3 samples exhibiting comparable Pd particle size. Similar measurements by X-ray absorption spectroscopy on a different 2 wt.% Pd/Al2O3 confirm that the baseline changes reflect the reversible reduction-oxidation of Pd. Hence, we demonstrate that changes in oxidation state of metal-based catalysts can be determined using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and that this behavior is part of the spectral changes that are returned by experiments under operando conditions.

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