摘要
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.
Make every oxide of rare earth metals (La,Ce,Pr,Nd,Sm,Gd,Dy, Ho,Er,Yb) solve in the agueous HCl and then drip NH3 solution of (β-acety lacetone to this solution. Control pH over precipitating pH of corresponding rare earth metal hydroxide and stir this solution for 5 - 8 h. Filtering the mixture and the solid is the rare earth 2. 4-pentadionate(Ⅰ). By means of measurement of rare earth content and analysis of C and H content, the composition of I can be decided. By measurement of the melting points (m ?p) of I , we can prove this composition and find how 'the Lanthanide Contract' influences m ?p. Oligomerization of propylene was studied using a triple catalyst system consisting of rare earth 2,4-pentadionate(Ⅰ) , triphenylphosphine (Ⅱ) , and ethylalu-minium sesquichloride (Ⅲ). It was known that the catalyst activity changed with the electronic structure of the rare earth elements. The distribution of contents of dimer products was similar.
出处
《纺织高校基础科学学报》
CAS
1997年第1期59-64,共6页
Basic Sciences Journal of Textile Universities
关键词
稀土戊二酮
配合物
丙烯齐聚
催化
rare earth 2,4-pentadionate, propylene oligomerization, triphenylphosphine, ethylariminium sesquichloride
