A series of 1,3-dialkyloxycalix[4]arene dibenzocrown ethers were synthesized in the fixed 1,3-alternate conformation with good yields by the reaction of 1,3-dialkyloxycalix[4]arenes with dibenzodimesylate in the presence of caesium carbonate. The three dimensional 1,3-alternate conformation was confirmed by X-ray crystal structure. Upon two phase extraction, NMR studies on the ligand–metal complex, single ion and competitive ion transport experiments through a bulk liquid membrane, 1,3-dipropyloxycalix[4]arene dibenzocrown-6, in which two benzo groups are symmetrically attached to the crown-6 linkage, gave one of the most efficient and selective extractabilities for caesium ion over other alkali metal ions. From supported liquid membrane experiments using 1 and 3 as organic carriers, permeation coefficients of the caesium ion were estimated to be 0.42 and 0.27 cm h–1, respectively. The selectivity of caesium over sodium ion was observed to increase with permeation time.
在
碳酸铯存在下,1,3-二烷氧基
钙并[4]烯与二苯并二
甲酸酯发生反应,合成了一系列具有固定 1,3 邻构象的 1,3 二烷氧基
钙并[4]烯二苯并
冠醚,并获得了良好的产率。X 射线晶体结构证实了这种三维 1,3 邻位构象。经过两相萃取、
配体-
金属复合物核磁共振研究、单离子和竞争性离子通过体液膜的传输实验,1,3-二丙基氧基
钙[4]烯二苯并冠-6(其中两个苯并基团对称地连接到冠-6 连接上)对
铯离子的萃取效率和选择性超过了其他碱
金属离子。在使用 1 和 3 作为有机载体的支撑液膜实验中,
铯离子的渗透系数估计分别为 0.42 和 0.27 cm h-1。据观察,
铯对
钠离子的选择性随着渗透时间的延长而增加。