摘要
Acetonitrile is a weakly donating ligand. The cationic compounds of CH<sub>3</sub>CN-coordinated transition metal are versatile homogeneous catalysts for the polymerization and isomerization of olefins and cycloolefins. The cationic compound of lanthanide[Eu（CH<sub>3</sub>·CN）<sub>3</sub>（BF<sub>4</sub>）<sub>3</sub>]<sub>n</sub> was prepared from the oxidation of Eu with NOBF<sub>4</sub> in CH<sub>3</sub>CN by Thomas in 1986. It was found that [Eu（CH<sub>3</sub>CN）<sub>3</sub>（BF<sub>4</sub>）<sub>3</sub>]<sub>n</sub> can catalyze the polymerization of styrene cyclohexadiene and other olefins. However, there is no information about the X-ray crystal structure of this compound.
