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Ruthenium-water system, potential

FIGURE 21.20 Potential-pH equilibrium diagram for the ruthenium-water system at 25 °C. [In the presence of solutions free from complexing substances.] (from Ref. 32). [Pg.712]

Figure 5. Potential -pH diagram for the system ruthenium-water at 25 C, adapted from Pourbaix (9). Figure 5. Potential -pH diagram for the system ruthenium-water at 25 C, adapted from Pourbaix (9).
For the ruthenium complexes in System 1, the potential of the Ru(II)/Ru(III) process (which was the initial model reaction for the definition of the F scale) shows very little sensitivity to the nature of MPhj—however, in all cases F for the complex with the AsPhj ligand is lower than (or equal to) for the complex with the PPhj ligand as predicted by the E values. For System 1 the data obtained in water are for combined electron and proton transfer processes, showing pH dependence , and the Ru(IV) oxo complexes resulting from the second oxidation process are potent catalysts for electro-catalytic oxidation of organic substrates . ... [Pg.506]

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Ruthenium system

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