A variety of piano-stool complexes of cyclopentadienyl ruthenium (II) with imidazole-based PN ligands have been synthesized starting from the precursor complexes [CpRu (C10H8)] PF6,[CpRu (NCMe) 3] PF6 and [CpRu (PPh3) 2Cl]. PN ligands used are imidazol-2-yl,-4-yl and-5-yl phosphines. Depending on the ligand and precursor different types of coordination modes were observed; in the case of polyimidazolyl PN ligands these were κ1P- ...