| Abstract |
New complexes of the type [Fe(eta (5)-Cp or Ind)(L)(L )(p -NCR)][BF4] (L, L = CO, P(OC6H5)(3), P(CH5)(3); R = C6H4N(CH3)(2). C6H4NO2, (E)-C(H)=C(H)C6H4NO2, (E)-C(H)=C(H)C6H4N(CH3)(2)) have been synthesised and characterised. Spectroscopic data were analysed in order to evaluate the tuning of the electronic density at the metal centre and the extension of the pi -delocalisation on the molecule, due to the presence of coligands with different acceptor/donor abilities. The structures of two complexes [Fe(eta (5)-C5H5)(CO)(P(OC6H5)(3))(P-NCC6H4NO2)][BF4] and [Fe(eta (5)-C9H7)(CO)(P(OC6H5)(3))(P-NCC6H4NO2)][BF4] were determined by X-ray crystallographic analysis. The compounds crystallised in the centrosymmetric space groups P (1) over bar and P2(1)/n, respectively. Bond distances within the nitrile ligand are discussed in order to evaluate the nature of iron-nitrile bonding in these complexes. (C) 2001 Elsevier Science B.V. All rights reserved. |
