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Organometallic synthesis in ambient temperature chloroaluminate(III) ionic liquids. Ligand exchange reactions of ferrocene

1997; Royal Society of Chemistry; Issue: 19 Linguagem: Inglês

10.1039/a702978k

2050-5671

Paul J. Dyson, Martin C. Grossel, Narmatha Srinivasan, T. A. Vine, Tom Welton, David J. Williams, Andrew J. P. White, Theodore Zigras,

Inorganic and Organometallic Chemistry

The ambient temperature ionic liquid system [bmim]Cl–AlCl3 (where [bmim]+ = 1-butyl-3-methylimidazolium cation) has been used to prepare a number of arene(cyclopentadienyl)iron(II) complexes of the type [Fe(C5H5)(arene)]+ from ferrocene. The ionic liquid acts as both solvent and Lewis acid source ([Al2Cl7]–). The products were only formed on addition of a proton source, [bmim][HCl2], confirming mechanistic formulations involving a combination of Lewis and Brønsted acid activity. The X-ray crystal structure analysis of [Fe(η5-C5H5)(η6-C6H5C6H4Br)][PF6] is also reported. The structure clearly shows both π–π stacking interactions between neighbouring cations and hydrogen bonds between the cations and anions.