New synthetic precursors for CO-coordinated, oxo-centred triruthenium(II,III,III) complexes with varied, carboxylato groups [Ru 3O(RCO2)6(CO)(solvent)2] where R = C2H5, CH3 and C6H5 have been prepared and characterised. Among the series, the propionato-bridged complex [Ru3O(C2H5CO2) 6(CO)(THF)2] (1) was structurally determined by single-crystal X-ray crystallography. Cyclic voltammetry revealed that the benzoato-bridged complex [Ru3O(C6H5CO 2)6(CO)(C2H5OH)2] in 0.1 mol dm-3 nBu4NPF6/DMF undergoes two consecutive one-electron processes assignable to the redox of the Ru3(μ 3-O) core, the redox potentials of which are highly dependent on the electron-donating/accepting nature of the carboxylato groups. UV-light excitation of the compounds in CH3CN resulted in the dissociation of CO to form the tris(CH3CN) compounds [Ru3O(RCO 2)6(CH3CN)3] (R = C 2H5, CH3 and C6H5). These compounds are highly useful as synthetic precursors to a wide range of μ3-oxo-trirutherium derivatives with well-defined redox responses.
All Science Journal Classification (ASJC) codes
- Inorganic Chemistry