Mixed-Valent Ru III Ru IV Configurationin an Oxido–Carboxylato-Bridged Diastereomeric Pair

An unprecedented diastereomeric pair [meso, ΔΛ (1); rac, ΔΔ/ΛΛ (2)] involving a doubly oxido–carboxylato-bridged mixed-valent RuIIIRuIV (d5d4, S = 1/2) state in [(acac)2RuIII(μ-O)(μ-CH3COO)RuIV(acac)2] (acac = acetylacetonate) was structurally characterized. 1n and 2n (n = +, 0, −) display comparable spectroelectrochemical features for the accessible redox states.