Boletín de la Sociedad Chilena de Química
Print version ISSN 0366-1644
DIAZ, C.; CABEZAS, N. and MENDIZABAL, F.. NEW ENTRY TO PIANO -STOOL ELECTRON RICH (PENTAMETHYL CYCLOPENTADIENYL) IRON COMPLEXES. Bol. Soc. Chil. Quím. [online]. 2002, vol.47, n.3, pp. 213-220. ISSN 0366-1644. http://dx.doi.org/10.4067/S0366-16442002000300003.
A new route to the electron rich pentamethylcyclopetadienyl iron complexes (n5-C5Me5)=Cp*) starting from the commercially available dimer [Cp*Fe(CO)2]2 ,is presented. Reaction of the dimer with I2 in CH2Cl2, affords the mononuclear carbonyl complex Cp*Fe(CO)2I which in turn reacts with bis(diphenylphosphinoethane) in toluene under Uv irradiation to give Cp*Fe(dppe)I. Treatment of Cp*Fe(dppe)I with the neutral ligands L (L = CH3CN, PPh3, SEt2) in the presence of TlPF6 affords the cationic derivatives [Cp*Fe(dppe)L]PF6 ,while that the reaction with S2(CH2C6H5 )2 in CH3OH yields the thiolate complex [Cp*Fe(dppe)S-CH2C6H5 ] PF6 .The unusual magnetic properties of these complexes are discussed. Extended Hückel OM calculation confirmed the most electron rich character of the Cp*Fe(dppe)+ derivatives than their unsustituted CpFe(dppe)+ .Electrochemical as well as Mösbauer data are in agree with this
Keywords : pentamethylcyclopentadienyl iron; electron rich fragments; OM calculation; organometallic.