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Issue 48, 2016
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Thermal decomposition of ammonium hexachloroosmate

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Abstract

Structural changes of (NH4)2[OsCl6] occurring during thermal decomposition in a reduction atmosphere have been studied in situ using combined energy-dispersive X-ray absorption spectroscopy (ED-XAFS) and powder X-ray diffraction (PXRD). According to PXRD, (NH4)2[OsCl6] transforms directly to metallic Os without the formation of any crystalline intermediates but through a plateau where no reactions occur. XANES and EXAFS data by means of Multivariate Curve Resolution (MCR) analysis show that thermal decomposition occurs with the formation of an amorphous intermediate {OsCl4}x with a possible polymeric structure. Being revealed for the first time the intermediate was subjected to determine the local atomic structure around osmium. The thermal decomposition of hexachloroosmate is much more complex and occurs within a minimum two-step process, which has never been observed before.

Graphical abstract: Thermal decomposition of ammonium hexachloroosmate

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Article information


Submitted
18 Oct 2016
Accepted
18 Nov 2016
First published
18 Nov 2016

Phys. Chem. Chem. Phys., 2016,18, 33134-33141
Article type
Paper

Thermal decomposition of ammonium hexachloroosmate

T. I. Asanova, I. Kantor, I. P. Asanov, S. V. Korenev and K. V. Yusenko, Phys. Chem. Chem. Phys., 2016, 18, 33134
DOI: 10.1039/C6CP07133C

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