Triarylphosphine Ligands with Pendant Electron-Rich “[Fe(κ2‑dppe)(η5‑C5Me5)(CC)]–” Substituents

The synthesis of four triaylphosphine ligands featuring electron-rich Fe­(II) “Fe­(κ2-dppe)­(η5-C5Me5)­CC–” pendant substituents in para and meta position(s) (1–4) is reported along with that of their corresponding radical cations (1–2[PF6] or 3–4[PF6]3). These triarylphosphines possessing redox-active organometallic substituents constitute a new class of phosphorus-based metallo-ligands. In contrast to many related ferrocenylphosphines, these metallo-ligands are stable and isolable in two redox-states. Their steric and electronic properties are also briefly discussed.