Thermodynamic properties of compounds in the PdO-H2O system at 25°C

The Mixed Gold–Palladium Polyoxo‐Noble‐Metalate [NaAuIII4PdII8O8(AsO4)8]11−

“…Thus, it was established that a number of mononuclear complexes, for example, [Pd(OH) x L 4Àx ] nÀ (L = H 2 O, Cl; x = 1-4) and [Au(OH) 2 (H 2 O) 2 ] + , may form in strongly acidic media (mainly in HClO 4 ), whereas the tetrahydroxo species exist in basic solutions. [1,2] At the same time there is rather little information about polynuclear Pd II and Au III complexes which assemble in the intermediate pH range on the way to precipitation of palladium(II) and gold(III) hydroxides. Thus Milić et al proposed the formation of a tetranuclear species formulated as {Pd(OH)} 4 4 + upon alkaline hydrolysis of H 2 [PdCl 4 ] in NaCl medium with a Pd II concentration higher than 2.5 mm, as based on potentiometric titration studies.…”