Nikolai V. Vologdin

Cyclic Voltammetry of 1,1′-bis(Diarylphosphino)metallocenes and Their Complexes with Palladium(II)

Cyclic voltammetry is used to study 1,1′-bis(diarylphosphino)metallocenes (PP) [M(η5-C5R4PAr2)2] (M = Fe; R = H; Ar = Ph, o-MeOC6H4, o-PrOC6H4, C6F5; M = Fe, R = Me, Ar = Ph; M = Ru, Os; R = H, Ar = Ph) and such Pd(II) complexes with these as neutral dichlorides [(PP)PdCl2], dication solvates [(PP)Pd(L)n]2+ (L = H2O, MeCN), and dication triphenylphosphines containing metal–Pd bond (PP)Pd(PPh3)]2+. The nature of the metallocene metal atom and aryl substituents at phosphor atoms and the formation of a metal–Pd bond affect redox potentials of these compounds. 1,1′-bis(Diphenylphosphino)metallocenes [M(η5-C5H4PPh2)2] (M = Fe, Ru, Os) feature similar electron-donating properties. Oxidation potentials of Pd(II) complexes can serve as a criterion indicating the formation of a metal–Pd bond.