A novel bis(m-phenylene)-26-crown-8-based lariat ether (i.e., 3b) was synthesized and characterized. It can bind paraquat derivatives more strongly than bis(m-phenylene)-26-crown-8 in solution. It forms pseudorotaxanes with two paraquat derivatives in the solid state. N-Methyl substitution was found to play an important role on the binding strength of lariat ether 3b. Furthermore, due to the introduction
合成并表征了一种新型双(间亚苯基)-26-冠-8 基套索醚(即 3b)。在溶液中,它可以比双(间亚苯基)-26-crown-8 更强地结合百草枯衍生物。它与两种固态百草枯衍生物形成假轮烷。发现 N-甲基取代对套索醚 3b 的结合强度起重要作用。此外,由于引入了两个苄氧基,它与百草枯衍生物的结合可以通过添加 K +(然后是 dibenzo-18-crown-6)来关闭(然后重新打开),并且解离百分比取决于添加的 K + 离子。