Synthesis, Structures, and Properties of the Phosphonium-1-indenylide (PHIN) Ligands 1-C9H6PPh3, 1-C9H6PMePh2, and 1-C9H6PMe2Ph and of the Corresponding Ruthenium(II) Complexes [Ru(η5-C5H5)(η5-PHIN)]PF6

Syntheses of the phosphonium-1-indenylide (PHIN) ligands triphenylphosphonium-1-indenylide (1-C9H6PPh3, I), methyldiphenylphosphonium-1-indenylide (1-C9H6PMePh2, II), and dimethylphenylphosphonium-1-indenylide (1-C9H6PMe2Ph, III) are reported, as are syntheses of the corresponding planar chiral ruthenium­(II) complexes [Ru­(η5-C5H5)­(η5-1-C9H6PPh3)]­PF6 (IV), [Ru­(η5-C5H5)­(η5-1-C9H6PMePh2)]­PF6 (V), and [Ru­(η5-C5H5)­(η5-1-C9H6PMe2Ph)]­PF6 (VI). The ruthenium complexes have been characterized by 1H, 13C, and 31P NMR spectroscopy, by X-ray crystallography, and by extensive DFT calculations, which produce optimized geometries consistent with the crystallographic data. The PHIN–Ru bond strengths are calculated to be ∼20 kcal/mol greater than the corresponding benzene–Ru bond strength of [Ru­(η5-C5H5)­(η6-C6H6)]+ and are compatible with the observed configurational stability of the complexes. That interconversion of enantiomers via interfacial exchange of the η5-bound ligands does not occur is demonstrated by the observation of diastereotopic phenyl groups in the 1H NMR spectrum of V and of diastereotopic methyl groups in the 1H NMR spectrum of VI.