Syntheses, X-ray crystal structures, and fluxional behavior of the clusters Cp*3
), and Cp*3
Cp*3Co3(μ2-H)3(μ3-H) (1) reacts with 2 equiv of CO to form the 48-electron dicarbonyldihydride cluster Cp*3Co3(μ2-CO)(μ3-CO)(μ-H) (2), which was studied by X-ray crystallography. 2 consists of an equilaterial triangle of cobalt atoms capped on each face by a μ-CO ligand. Line-shape analyis of the CO regionin the variable temperature 3C NMR of 2 allowed the barrier of interconversion of the μ2- and μ3-CO ligands to be measured.