Behaviors of the one-electron reduction species of {RuNO}(6)-type complexes. An oxygen-transfer reaction occurs in the nitrosyl site of cis-[Ru(NO center dot)X(bpy)(2)](n+) (X = ONO2 for n = 1, X = CH3CN, H2O for n = 2) ({RuNO}(7)-type) to give an identical nitro species

Degradation sequences of cis-[Ru(NO.)X(bpy)(2)](n+) (X = ONO2, OCHO, OCOMe, NO2, Cl for n = 1; X = CH3CN, H2O for n = 2) ({RuNO}(7)-type), a one-elect ron reduction species of {RuNO}(6)-type complexes, were investigated in CH3 CN by monitoring using electrochemical techniques (both cyclic and hydrodyn amic voltammetries). The results show that an oxygen transfer occurs effect ively at the nitrosyl site of cis-[Ru(NO.)X(bpy)(2)](n+) (X = ONO2 for n = 1, X = CH3CN, H2O for n = 2) to give identical nitro species, cis-[Ru(NO2)( CH3CN)(bpy)(2)](+). The extent that the nitrosyl-to-nitro conversion procee ded, however, differs depending on the X ligands; X = CH3CN and H2O complex es gave the nitro species in almost 40% yield, while X = ONO2 complex affor ded nearly 80%. The monitoring results of the degradation sequences, along with the differences in yields, suggest that different processes are operat ing separately in the oxygen-transfer reaction. We propose some possible pr ocesses for both reactions, although a further investigation is needed for a detailed explanation.