摘要
本文用斜率法研究了五种酯酮型双(4’-苯并-15-冠-5)对苦味酸钾(KPi)的萃取性能,结果表明,五种双冠醚与 K^+均以2:1(冠醚单元:K^+)形式络合,萃取平衡常数 log K_e 值分别为:5.68,5.26,5.19,4.97和4.93。用饱和法验证了了萃合物的组成,其结果与斜率法一致。
The extraction of potassium picrate(KPi)with five new ester ketonic type bis(crown ether)s containing benzo-15-crown-5 moieties by slope analysis was studied.Extractions were carried out at 25℃ from 1×10^(-3)M aqueous KPi solution or 5×10^(-3)M KPi and 5×10^(-2)M K_2SO_4aqueous solution with 2×10^(-4)--1x10^(-3)M bis(crown ether)s.It was found that the stiochiometry in the species extracted is 1:2 with respect to K^+ and each bis(crown ether).The extraction constants were evaluated and iogKe are 5.68,5.26,5.19,4.97 and 4.93 respectively.The compositions of extracted complexes were confirmed by saturated method.The investigation indicate that the five bis(crown ether)s also form sandwich-type 2:1 complexes with KPi.
出处
《河南科学》
1990年第3期50-54,共5页
Henan Science
关键词
双冠醚
萃取
苦味酸钾
bis(crown ether)
extraction
potassium picrate
