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Issue 40, 2020
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Insight into the thermal decomposition of ammonium hexahalogenoiridates(iv) and hexachloroiridate(iii)

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Abstract

Thermal decomposition of (NH4)3[IrCl6]·H2O, (NH4)2[IrCl6] and (NH4)2[IrBr6] in reductive and inert atmospheres has been investigated in situ using quick-EXAFS and temperature-resolved powder X-ray diffraction. For the first time, (NH4)2[Ir(NH3)Cl5] and (NH4)2[Ir(NH3)Br5] have been proven as intermediates of thermal decomposition of (NH4)3[IrCl6]·H2O, (NH4)2[IrCl6] and (NH4)2[IrBr6]. Thermal degradation of (NH4)2[IrCl6] and (NH4)2[IrBr6] is a more complex process as suggested previously and includes simultaneous formation of (NH4)2[Ir(NH3)Cl5] and (NH4)2[Ir(NH3)Br5] intermediates mixed with metallic iridium. In the inert atmosphere, complexes (NH4)[Ir(NH3)2Cl4] and (NH4)[Ir(NH3)2Br4] as well as [Ir(NH3)3Br3] were proposed as possible intermediates before formation of metallic iridium particles.

Graphical abstract: Insight into the thermal decomposition of ammonium hexahalogenoiridates(iv) and hexachloroiridate(iii)

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Article information


Submitted
20 May 2020
Accepted
24 Jul 2020
First published
24 Jul 2020

Phys. Chem. Chem. Phys., 2020,22, 22923-22934
Article type
Paper

Insight into the thermal decomposition of ammonium hexahalogenoiridates(IV) and hexachloroiridate(III)

K. V. Yusenko, V. V. Zvereva, S. A. Martynova, I. P. Asanov, C. La Fontaine, O. Roudenko, A. I. Gubanov, P. E. Plyusnin, S. V. Korenev and T. I. Asanova, Phys. Chem. Chem. Phys., 2020, 22, 22923
DOI: 10.1039/D0CP02743J

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