Synthesis and properties of nitrozoruthenium thiocarbamide complex

The [RuNO(Thio)(4)Cl]Cl-2 compound (where Thio is thiocarbamide) was synthe sized by reacting nitrozochloro complexes of Ru with thiocarbamide. Its str ucture and properties in solutions were studied by IR, EAS, EPR, pH-metric, and electrical conductivity methods. The complex was found to have octahed ral structure, with the chlorine atom in the trans-position relative to the nitrozo group, and four Thio groups coordinated through the sulfur atom an d lying in the equatorial plane. This compound is labile in solutions. The mechanism and rate constants of the first hydrolysis stage were determined at 25, 50, and 75 degreesC, and the enthalpy of the reaction was estimated. With a Thio excess, the nitrozo group is replaced to form the Ru(III) and Ru(II) thiocarbamide complexes.