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The redox properties of mononuclear dicarbonyl and carbonylphosphine rhodium (I) complexes (CO)(L)Rh(RC(O)CHC(O)R’) with chelate β-diketonate ligands (L = CO, PPh3; R, R’ = Me, Ph; CF3, C4H3S) were studied by electrochemical methods at platinum, glassed carbon and dropping mercury electrodes in acetonitrile. Schemes of their redox reactions were established

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Redox properties of binuclear Cp(CO) 3 MnRh(µ-C=CHPh)(acac) complex were studied by electrochemical methods at platinum, glassed carbon and dropping mercury electrodes in acetonitrile.It was found that a reduction of the complex resulted in the formation of CpMn(CO) 3 and rhodium Rh 0 compounds whereas an oxidation gave CpMn(CO) 3 and Rh III compounds.

А stripping voltammetry method was developed for the determination of cerium (III) on graphite electrode as a poorly soluble compound in filtrate after sorption. The cerium (III) concentration presents a good linear relationship over the range of 0.5-10 mg/l. Its linear equation is I = (0.56±0.03)с + + (0.54±0.10), with a correlation coefficient >0.99. The detection limit of cerium (III) is 0.1 mg/l. The absence of a significant systematic error is shown by the added-found method. Using the developed technique, the concentration of cerium (III) in the filtrates after sorption has been determined.