Abstract
With [Cp*Ru(OMe)]2 (1) as starting material, a number of 2,4-pentanedionato complexes Cp*Ru(2,4-pentanedionate) were prepared. The solid-state structure of Cp*Ru(1-phenyl-2,4-pentanedionate) (3) was elucidated by X-ray crystallography, and the complex was found to be a dimer in the solid state, as previously established for Cp*Ru(2,4-pentanedionate) (2). The molecular weight of 3 in benzene indicates a dimer (3-3) in solution as well. Low-temperature 1H NMR spectroscopy reveals a process involving dissociation of the dimer into monomers associated with an inversion of the pentanedionate ligand at Ru. The activation energy (Ea = 43.5 ± 0.7 kJ/mol, toluene-d8) reflects the enthalpy of dissociation of the dimer. All dimers are easily cleaved with two-electron ligands L, resulting in the mononuclear complexes Cp*Ru(2,4-pentanedionate)L. Besides isolable complexes with L = phosphine, phosphite, and CO, labile adducts of the same composition with σ-S and N donor ligands (L = methyl p-tolyl sulfoxide, ethyl meth...
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