Synthesis of new donor/acceptor 5-cyclopentadienyl and 5-indenyliron(II) comp...

• Author(s): Garcia, M. Helena ; Robalo, M. Paula ; Teixeira, António P. S. ; Dias, A. R. ; Piedade, M. Fátima M. ; Duarte, M. Teresa
• Date: 2001
• Persistent ID: http://hdl.handle.net/10174/4025
• Origin: Repositório Científico da Universidade de Évora
• Subject(s): Iron complexes; Benzonitrile derivatives; Indenyl; Crystal structures; Cyclopentadienyl
• Document Type: Article
• Language: English

Description

New complexes of the type [Fe( 5-Cp or Ind)(L)(L )(p-NCR)][BF4] (L, L =CO, P(OC6H5)3, P(C6H5)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 -delocalisation on the molecule, due to the presence of coligands with different acceptor/donor abilities. The structures of two complexes [Fe( 5-C5H5)(CO)(P(OC6H5)3)(p-NCC6H4NO2)][BF4] and [Fe( 5-C9H7)(CO)(P(OC6H5)3)(p-NCC6H4NO2)][BF4] were determined by X-ray crystallographic analysis. The compounds crystallised in the centrosymmetric space groups P1 and P21/n, respectively. Bond distances within the nitrile ligand are discussed in order to evaluate the nature of iron–nitrile bonding in these complexes.