Investigation of thermal properties of double complex salts [M(NH)Br][AuBr]· nHO, M = Rh, Ir.

Novel double complex salts [M(NH)Br][AuBr]· nHO, M = Rh, Ir, have been synthesized and examined. The processes of thermal decomposition of the compounds in inert and reductive atmospheres have been studied and intermediate products identified. Simultaneous thermal analysis with parallel mass-spectrometric analysis of evolved gases (STA-EGA) has been employed for identification of main gaseous products of thermolysis in inert atmosphere. It has been revealed that the final products of decomposition in inert or reductive atmospheres are fine powders of gold and the corresponding platinum metal with sizes of crystallites 4-40 nm. The possibility of preparation of the metastable solid solution AuIr on thermolysis of [Ir(NH)Br][AuBr]·HO in inert atmosphere has been demonstrated. [ABSTRACT FROM AUTHOR]