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Issue 26, 2015
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In situ site-selective transition metal K-edge XAS: a powerful probe of the transformation of mixed-valence compounds

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Abstract

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 K0.1CoII4[CoIII(CN)6]2.7·20H2O Prussian Blue analogue (containing Co2+ and Co3+ ions in two different Oh sites) into Co3O4 (containing Co2+ ions in a Td site and Co3+ in an Oh site). By recording the Co K-edge X-ray absorption spectra using a spectrometer aligned at the Co Kβ1,3 emission line, the evolution of each species was singly monitored from 20 °C up to the oxide formation. The experimental spectrum of the Co2+(Td) and Co3+ (Oh) 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.

Graphical abstract: In situ site-selective transition metal K-edge XAS: a powerful probe of the transformation of mixed-valence compounds

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Publication details

The article was received on 04 May 2015, accepted on 28 May 2015 and first published on 28 May 2015


Article type: Paper
DOI: 10.1039/C5CP02591E
Citation: Phys. Chem. Chem. Phys., 2015,17, 17260-17265
  • Open access: Creative Commons BY-NC license
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    In situ site-selective transition metal K-edge XAS: a powerful probe of the transformation of mixed-valence compounds

    A. Bordage, V. Trannoy, O. Proux, H. Vitoux, R. Moulin and A. Bleuzen, Phys. Chem. Chem. Phys., 2015, 17, 17260
    DOI: 10.1039/C5CP02591E

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