Synthesis, Structure, and Electrochemical Properties of 2,3,4,5-Tetraphenyl-1-Monophosphaferrocene Derivatives.

Heteroleptic 2,3,4,5-tetraphenyl-1-monophosphaferrocene [FeCp(η-PCPh)] was obtained at a 62% yield through the reaction of lithium 2,3,4,5-tetraphenyl-1-monophosphacyclopentadienide Li(PCPh) () with [FeCp(η-CHCH)][PF]. The structure of 1-monophosphaferrocene and its W(CO)-complex were confirmed by multinuclear NMR and single-crystal X-ray diffraction study and further supported by DFT calculations. Cyclic voltammetry demonstrated that [FeCp(η-PCPh)] has a quasi-reversible oxidation wave. The comparison of the properties of phosphaferrocene with those of W(CO)-complex shows the possibility of changing the coordination type during oxidation.