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Abstract Experiments show that Ru(terpy)(bpy)(OH2)2+ is highly active as a catalyst toward oxidation of water into molecular oxygen in spite of the mononuclear character of the complex, while Ru(terpy)(bpy)Cl+ shows no activity at all. It is also confirmed that Ru(terpy)(bpy)(OH2)2+ is fairly stable under strongly oxidizing conditions in the presence of cerium(IV) ammonium nitrate, Ce(NH4)2(NO3)6, which was evidenced by spectrophotometric, mass spectrometric, and gas chromatographic analysis.
Masaoka et al. (Sun,) studied this question.