COMPLEXATION OF RUTHENIUM(IV) WITH 1,10-PHENANTHROLINE UNDER MICROWAVE-RADIATION

The complexation of ruthenium(IV) with 1,10-phenanthroline was studied in order to find out how the composition of the reaction mixture (pH and concentrations of 1,10-phenanthroline, hydroxylamine, and chloride ions) and the parameters of microwave sample preparation (radiation p ower, exposure time, sample volume, and the autoclave pressure) affect the reaction. It is found that the decrease in the formation time of luminescent ruthenium(II) tris-1,10-phenanthrolinate under microwave i rradiation (5 min) as compared to the time of its formation in a boili ng water bath (2-2.5 h) is caused not only by heating effects but also by the effect of pressure (in the autoclave) and microwave radiation as a sort of electromagnetic radiation. Pressure and radiation cause c hanges in cation hydration, in inner-sphere ligand exchange, and in ru thenium(IV) reduction. The use of microwave radiation made it possible to decrease the time of sample preparation for the luminescence deter mination of ruthenium by I,10-phenanthroline more than 20 times.