Thermal decomposition of (NH4)2[PdCl6] studied by in situ X-ray absorption spectroscopy

A new approach towards the study of thermal decomposition and formation processes of nanoalloys: the double complex salt [Pd(NH3)4][PtCl6]

The thermal decomposition process of the [Pd(NH₃)₄][PtCl₆] double complex salt was investigated using in situ XAFS, XPS, HAXPES, and XRD.

Thermal decomposition of ammonium hexachloroosmate

A one-step mechanism of the thermal decomposition of (NH₄)₂[OsCl₆] suggested previously proves to be unworkable under a time-resolved ED XAFS and PXRD study.

Microsecond time-resolved energy-dispersive EXAFS measurement and its application to film the thermolysis of (NH₄)₂[PtCl₆]

Microsecond (μs) time-resolved extended X-ray absorption fine structure spectroscopy (EXAFS) has been developed using an energy-dispersive EXAFS (EDE) setup equipped with a silicon Quantum Detector ULTRA. The feasibility was investigated with a prototypical thermally driven redox reaction, the thermal decomposition of (NH₄)₂[PtCl₆]. EXAFS data were collected with snapshots every 60 μs during the course of the thermolysis reaction, then averaged for 100 times along the reaction to get better signal to noise ratio which reduces the time resolution to 6 millisecond (ms). Our results provide direct structural evidence of cis-PtCl₂(NH₃)₂ as the intermediate, together with continuous electronic and geometric structure dynamics of the reactant, intermediate and final product during the course of the thermolysis of ((NH₄)₂[PtCl₆]. The thermal effect on EXAFS signals at high temperatures is considered in the data analysis, which is essential to follow the reaction process correctly. This method could also be applied to other reaction dynamics.