In situ site-selective transition metal K-edge XAS: a powerful probe of the transformation of mixed-valence compounds
| Autor: | Olivier Proux, Robinson Moulin, Anne Bleuzen, Hugo Vitoux, Amélie Bordage, Virgile Trannoy |
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| Přispěvatelé: | Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), European Synchrotron Radiation Facility (ESRF) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Prussian blue
X-ray absorption spectroscopy Valence (chemistry) Absorption spectroscopy Oxide Analytical chemistry General Physics and Astronomy chemistry.chemical_compound chemistry K-edge Transition metal Physical chemistry [CHIM]Chemical Sciences Emission spectrum Physical and Theoretical Chemistry |
| Zdroj: | Physical Chemistry Chemical Physics Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2015, 17 (26), pp.17260-17265. ⟨10.1039/c5cp02591e⟩ 'Physical Chemistry Chemical Physics ', vol: 17, pages: 17260-17265 (2015) |
| ISSN: | 1463-9076 1463-9084 |
| Popis: | International audience; We present herein the first in situ site-selective XAS experiment performed on a proof-of-principle transformation of a mixed-valence compound: the calcination of the K0.1Co4II[Co-III(CN)(6)](2.7)center dot 20H(2)O Prussian Blue analogue (containing Co2+ and Co3+ ions in two different O-h sites) into Co3O4 (containing Co2+ ions in a T-d site and Co3+ in an O-h site). By recording the Co K-edge X-ray absorption spectra using a spectrometer aligned at the Co K beta(1,3) emission line, the evolution of each species was singly monitored from 20 degrees C up to the oxide formation. The experimental spectrum of the Co2+(T-d) and Co3+ (O-h) species in Co3O4 is reported for the first time. Our results demonstrate the possibilities offered by site-selective XAS for the investigation of chemical transformations and the study of materials under working conditions whenever the chemical element of interest is present in several states and/or sites |
| Databáze: | OpenAIRE |
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