Construction of a hexanuclear cluster composed of spatially separated Co3 and Ru3 units: X-ray diffraction structure of Co3(CO)9[μ3-CCO2CH2CC{HRu3(CO)9}

Abstract

Treatment of the tricobalt cluster $${\text{Co}}_3 ({\text{CO}})_9 (\mu _3 - {\text{CCO}}_{\text{2}} {\text{CH}}_{\text{2}} {\text{C}} \equiv {\text{CH)}}$$ with the activated triruthenium cluster Ru3(CO)10(MeCN)2 affords the acetylide-bridged hexanuclear cluster Co3(CO)9[μ3–CCO2CH2CC{HRu3(CO)9}] in moderate yield. The new cluster was characterized in solution by IR spectroscopy and molecular structure was established by X-ray diffraction analysis. Co3(CO)9[μ3–CCO2CH2CC{HRu3(CO)9}] crystallizes in the triclinic space group P(−1), a = 8.728(1) A, b = 12.916(2) A, c = 14.663(2) A, α = 82.950(2)°, β = 82.465(2)°, γ = 86.199(2)°, V = 1624.2(4) A3, Z = 2, d calc = 2.207 mg/m3; R = 0.0263, R w = 0.0623 for 3596 observed reflections with I > 2σ(I). The coordination of the triruthenium cluster to the acetylene ligand of Co3(CO)9(μ3–CCO2CH2C≡CH) is confirmed, and the structural details associated with the acetylide-bridged triruthenium frame are contrasted with other structurally characterized Ru3 clusters bound by a 5e-acetylide ligand.