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将10种稀土元素(La、Ce、Pr、Nd、Sm、Gd、Dy、Er、Ho、Yb)的氧化物分别用盐酸溶解,然后滴加戊二酮(acac)氨液至过量(50％～100％),用氨水调节溶液pH值在每个稀土沉淀的pH值以上,搅拌5～8h,过滤得到稀土的戊二酮配合物(Ⅰ).通过稀土元素(R_E)分析和C、H含量测定可以确定Ⅰ的组成为R_E(acac)_3·nH_2O;熔点测定可以进一步验证该组成,并可观察到“镧系收缩”对熔点的影响.用10种稀土的戊二酮配合物与三苯基磷、倍半氯乙基铝组成的三元催化剂进行丙烯齐聚实验,发现齐聚的主产品为六碳烯烃,且催化活性随着稀土元素的离子中f电子的周期性填充呈现规律性的变化.不同稀土催化所得六碳烯烃的分布规律相类似.
The oxide of 10 kinds of rare earth elements (La, Ce, Pr, Nd, Sm, Gd, Dy, Er, Ho, Yb) was dissolved with hydrochloric acid respectively and then acac ammonia solution was added dropwise to excess (50% ~ 100%), the pH value of the solution was adjusted with ammonia water above the pH value of each rare earth precipitate, stirred for 5-8h, and the rare earth pentanedione complex (I) was obtained by filtration.Rare earth element (R_E) analysis and C, H The content of Ⅰ can be determined as R_E (acac) _3 · nH_2O, the melting point determination can further verify the composition and the effect of “lanthanide shrinkage” on the melting point can be observed.Using ten kinds of rare earth pentanedione complex and tris Phenylphosphine, sesquichloroethyl aluminum composition of the three yuan catalyst propylene oligomerization experiments and found that the main product of oligomerization of hexene olefin, and the catalytic activity of rare earth elements in the f ions in the periodic filling of electrons showed a law The change of sex.Different rare earth catalytic hexa-olefins distribution similar.