Reaction of (ArO)2Sm(THF)4 (ArO = 2,6-di-tert-butyl-4-methylphenolate) with Et2AlCl in THF gives SmCl2 (1) and (ArO)AlEt2(THF) (2) via ligand exchange. Complex 1 reacts with cyclooctatetraene (C8H8) to give [(C8H8)SmCl(THF)2]2 (3). Crystal structural determinations show that complex 2 has a monomeric structure, the aluminum atom is coordinated by two carbon atoms and two oxygen atoms, to form a distorted tetrahedron. Complex 3 has a dimeric structure, the samarium atom is coordinated by a cyclooctatetraenyl ring, two chorine atoms and two oxygen atoms, the coordination number of the central metal is 9.

(ArO)2Sm(THF)4 (ArO = 2,6-二叔丁基-4-甲基酚基)与Et2AlCl在四氢呋喃中发生配体交换反应, 生成SmCl2 (1)和(ArO)AlEt2(THF) (2).1进一步与环辛四烯(C8H8)发生氧化还原反应, 生成[(C8H8)SmCl(THF)2]2 (3).晶体结构测定表明配合物2具有单分子结构, 两个碳原子和两个氧原子与铝原子配位, 形成一个扭曲的四面体.配合物3具有双分子固态结构, 中心金属钐与一个环辛四烯、两个氯原子和两个氧原子配位, 其形式配位数为9.

The polymerization of acrylonitrile initiated by organolanthanide complexes alone is studied for the first time. The effect df polymerization conditions on catalytic activity of the title complex and molecular weight of the polymers produced have been studied.

> The reaction of NdCl 3 with lithium methylnaphthalene in 1:2 mole ratio in THF generates black powder.The powder reacts with cyclooctatetraene（COT）in THF to form the title complex.[Li（THF） 4 Nd（C 8 H 8 ） 2 ]·2THF crystallizes in the monoclinic space group P2/c with unit-cell dimensions a=1.7858（7）nm,h=1.3243（4）nm,c=1.8086（6）nm.β=106.52（4）°,V=4.10 nm 3 and D c =1.268 g/cm 3 for Z=4.F（000）=1660,R=0.0774,R_n=0.0733.The complex consists of discrete ion-pair and two THF moleculesadduct.In the anion,the neodymium atom is coordinated by two COT rings.The structure of the cation showsthat the lithium atom is attached with THF molecules only.

The reactions of YbCl2, SmCl2, NdCl2 with C8H8 have been studied.It is found that SmCl2, NdCl2 can react with C8H8 in THF at room temperature directly, forming SmCl3 (Sm(C8H8)Cl·2THF); NdCl3, and (Nd(C8H8)Cl·2THF) respectively, which were characterized by elemental analysis and IR spectra.However, YbCl2 does not react with C8H8 under the same conditions.