Diiodine complex of diferrocenyl(phenyl)phosphine sulfide: the structural and electrochemical behaviour of Fc2(Ph)PS · I2

Treatment of diferrocenyl(phenyl)-phosphine sulfide with an equimolar quantity of diiodine in dichloromethane produces the molecular charge-transfer adduct Fc2(Ph)PS · I2, which has been fully characterised by X-ray crystallography and spectroscopically. Mössbauer spectroscopy shows that the bulk material contains predominantly Fe2+ and ca. 24% of a Fe3+ species, formed through the concommitant oxidation of the iron. The electrochemistry of Fc2(Ph)PS · I2, Fc2(Ph)PS and Fc2(Ph)P has been investigated using a combination of cyclic voltammetry and differential pulse voltammetry.