摘要
报道了标题试剂的合成方法,测定了酸式电离常数,pK_(a_1)=3.10±0.2,pK_(a_2)=4.80±0.05.提出了二元弱酸的两相分配常数K_d及两相电离常数pK_(aE)的计算公式;经实验测得在CHCl_3-H_2O体系中,lg K_d=5.7±0.1,pK_(aE1)=8.8,pK_(aE2)=13.6。
The title compound, a new acyclic polyether with two terminal β-diketone groups, is a useful reagent for the extraction of metals. The synthetic method is reported in this paper. The title compoundis a dibasic acid, its acidic ionization constants have been determinedpK_(a1)=3.10±0.02, pK_(a2)=4.80±0.05. The equations for the calculation ofdiphase constants K_d and pK_(aE1), pK_(aE2) are suggested. The values deter-mined in CHCl_3-H_2O system are lg K_d=5.7±0.1, pK_(aE1)=8.8 and pK_(aE2)=13.6.
出处
《湘潭大学自然科学学报》
CAS
CSCD
1991年第1期68-74,共7页
Natural Science Journal of Xiangtan University
关键词
非环聚醚
萃取剂
电离常数
合成
Acyclic polyether
acidic ionization coastant
diphase distribution coefficient
diphase ionization coustant
