SYNTHESIS OF A NEW TYPE OF CH_3CN-COORDINATED LANTHANIDE COMPOUNDS Ln(CH_3CN)_9(AICI_4)_3CH_3CN
<正> Acetonitrile is a weakly donating ligand. The cationic compounds of CH_3CN-coordinated transition metal are versatile homogeneous catalysts for the polymerization and isomerization of olefins and cycloolefins. The cationic compound of lanthanide[Eu(CH_3·CN)_3(BF_4)_3]_n was prepared from the oxidation of Eu with NOBF_4 in CH_3CN by Thomas in 1986. It was found that [Eu(CH_3CN)_3(BF_4)_3]_n can catalyze the polymerization of styrene cyclohexadiene and other olefins. However, there is no information about the X-ray crystal structure of this compound.