Synthesis of a Bis(1,2,3-phenylene) Cryptand and Its Dual-Response Binding to Paraquat and Diquat

[摘要]：A bis(1,2,3-phenylene) cryptand has been synthesized and used to prepare 1: 1 complexes with paraquat and diquat, with association constants of 2.2 x 10(3) M-1 and 3.7 x 10(3) M-1, respectively, in CHCl3/CH3CN (1: 1). In the solid state this cryptand forms a taco complex with paraquat, which has never been found before in cryptand/paraquat complexes. Furthermore, its binding to paraquat and diquat in solution can be switched off (and back on) by addition of acid or K+ (and then base or 18-crown-6).

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