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仲胺型双冠醚与四苯硼酸碱金属盐在丙酮溶液中。25℃下的电导说明它们与Na~+可能形成1∶1络合物(冠醚单元∶金属离子),而与K~+、Rb~+、Cs~+离子则形成2∶1络合物。用Schlff碱型和仲胺型双-(苯并15-冠-5)在水-氯仿体系中进行萃取,测量了分配比D和萃取平衡常数K,发现后者的K值均大于前者。双冠醚F_2对K~+的萃取能力最强,选择性最佳。
Secondary amine type double Crown ether and alkali metal tetraphenylborate in acetone solution. The conductance at 25 ° C suggests that they may form a 1: 1 complex (crown ether unit: metal ion) with Na ~ + and a 2: 1 complex with K ~ +, Rb ~ + and Cs ~ + ions . The Schiff base and secondary amine bis- (benzo 15-crown-5) were extracted in a water-chloroform system. The distribution ratio D and extraction equilibrium constant K were measured. The K values of the latter were found to be greater than the former. Double crown ether F_2 has the strongest extraction ability to K ~ + and the best selectivity.