The electrochemical behavior of rhodium at low-temperature carbamide-chloride and acetamide-chloride melts was investigated. It was found that, during rhodium anodic dissolution in carbamide and acetamide containing chloride melts, mixed complexes [Rh(NH3)4Cl2]+ of quasi-octahedral symmetry D4h are produced. The composition and structure of nascent complex ions have been studied. During electrochemical reduction of [Rh(NH3)4Cl2]+ complexes, the synthesis of Rh nanoparticles, as well as Fe, Cu, and Mo nanocoatings, were realized.

It has been shown that low-temperature melts : carbamide-NH4Cl (1200 C), acetamide- NH4Cl (800 C), carbamide-imidazole- NH4Cl (700C) and thiocarbamide- NH4Cl (1600 C) can be used to study the electrochemical behaviour of noble metals (Pt, Pd, Rh). The mechanism and kinetics of electrode processes have been determined, passivation of electrodes and complex formation of metal ions with melt constituents have been established. Methods for the electrodeposition of metals as powders and coatings, macro - and nanostructure have been developed.

The electrochemical behavior of iridium and ruthenium in low-temperature melts based on carbamide and acetamide was studied. It was shown that the electrochemical dissolution of metals in the mentioned melts is accompanied by passivation and results in the formation of Ir(III) and Ru(III) ammonia complexes, which are discharged to the metal irreversibly in one step. The stationary electrolysis of carbamide and acetamide melts leads to the deposition of metal on the metallic substrates (Pt, Cu, Mo) in the form of microcrystalline electroplating.

It was ascertained that in carbamide-and acetamide-chloride melts at anodic dissolution of rhodium some mixed complexes [Rh(NH 3 ) 4 Cl 2 ] + form which are of quasioctahedral structure and D4h symmetry. During cathodic reduction of the obtained complexes Rh(III) in the investigated melts the synthesis of nanoparticles Rh was carried out as well as nanocoating of Fe, Cu and Mo by them.