Abstract
Ruthenium(III) hydrate has been precipitated in aqueous solution from the soluble hydrated RuCl 3. The thermal behavior of ruthenium(III) hydrate has been investigated by DTA and TG in air and in nitrogen. The compound undergoes a disproportionation reaction between 100 and 150°C yielding Ru(metal)+RuO 2· xH 2O. In nitrogen, the metal crystallizes beyond 450°C whereas it is fully oxidized in air in the temperature range 150–300°C. RuO 2 crystallizes on a sharp exothermic peak, the temperature of which depends on the residual water content. An estimate of the enthalpy of crystallization is given, and the oxidation mechanism is discussed.
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