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冠醚具有新的独特的配位能力,能与碱及碱土金属生成配位化合物。应用量热滴定(也称熵滴定)测定冠醚配位作用的热力学性质是研究冠醚的结构与反应性能关系的主要手段。(?)zatt 报告了这方面的许多工作,取得了较好的结果。Pedersen 报告,在二氯甲烷-水溶液中用萃取法测定钠离子与二环己基-15-冠-5的配位能力强于二环己基-16-冠-5。Olsher 报道苯并-13-冠-4的二氯甲烷或苯溶液从水中萃取锂盐的选择性大于苯并-12-
Crown ether has a new unique coordination ability, with alkaline and alkaline earth metal complexes generated. The thermodynamic properties of calorimetric titration (also known as entropy titration) for the determination of crown ether coordination are the main means to study the relationship between the structure of crown ether and the reaction performance. (?) zatt reported a lot of work in this area and achieved good results. Pedersen reported that the coordination ability of sodium ions to dicyclohexyl-15-crown-5 was stronger than that of dicyclohexyl-16-crown-5 as determined by the extraction method in methylene chloride-water solution. Olsher reported that the selectivity for the extraction of lithium salts from water by a solution of benzo-13-crown-4 in dichloromethane or benzene is greater than that of benzo-12-