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Four divalent lanthanide complexes Sm(ArO)2 -(THF)4) Yb(ArO)2(THF)3, Eu(ArO)2(THF)3 (ArO=2,6-di-tert-butyl-4-methylphenolate) and (ButCp)2Sm(THF)2 were synthesized. Their catalytic activities on the polymerization of acrylonitrile were studied. The cataly