Nonanuclear Ruthenium Carbonyl Cluster Complexes with a Novel Metallic Skeleton: Pentagonal Bipyramid with Two Equatorial Edges Spanned by Metal Atoms

The nonanuclear cluster complexes [Ru9(μ-H)2(μ4-κ2-ampy)4(CO)17] and [Ru9(μ3-H)(μ-H)(μ4-κ2-ampy)3(CO)18]
(ampy = 2-imido-6-methylpyridine) have been prepared by
heating [Ru6(μ3-H)2(μ5-κ2-ampy)(μ-CO)2(CO)14] in undecane
at reflux temperature. Both compounds feature a novel metallic
skeleton that can be described as a pentagonal bipyramid with
two equatorial edges spanned by metal atoms. In both cases,
the ampy ligands are attached to edge-bridging Ru atoms
through the pyridine N atoms, while their imido N atoms cap
metallic triangles formed by the metal atoms of one of the metal-bridged edges and one of the apical metal atoms.