A Mechanism Study of Redox Reactions of the Ruthenium-oxo-polypyridyl Complex

Over the years, Ru^IV(bpy)₂(py)(O)²⁺([Ru^IVO]²⁺) has garnered considerable interest owing to its extensive use as a polypyridine mono-oxygen complex. However, as the active-site Ru=O bond changes during the oxidation process, [Ru^IVO]²⁺ can be used to simulate the reactions of various high-priced metallic oxides. In order to elucidate the hydrogen element transfer process between the Ruthenium-oxo-polypyridyl complex and organic hydride donor, the current study reports on the synthesis of [Ru^IVO]²⁺, a polypyridine mono-oxygen complex, in addition to 1H and 3H (organic hydride compounds) and 1H derivative: 2. Through ¹H-NMR analysis and thermodynamics- and kinetics-based assessments, we collected data on [Ru^IVO]²⁺ and two organic hydride donors and their corresponding intermediates and established a thermodynamic platform. It was confirmed that a one-step hydride transfer reaction between [Ru^IVO]²⁺ and these organic hydride donors occurs, and here, the advantages and nature of the new mechanism approach are revealed. Accordingly, these findings can considerably contribute to the better application of the compound in theoretical research and organic synthesis.