Thermal decomposition of ammonium hexachloroosmate

Research output: Contribution to journalJournal article – Annual report year: 2016Researchpeer-review

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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.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume18
Pages (from-to)33134-33141
Number of pages8
ISSN1463-9076
DOIs
Publication statusPublished - 2016
CitationsWeb of Science® Times Cited: No match on DOI

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