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[摘要]：A new pyridine-containing crown ether, dipyrido[30]crown-10 (DP30C10), has been synthesized and has been shown to form [2]pseudorotaxanes spontaneously with paraquat derivatives in solution, as demonstrated by proton NMR spectroscopy and mass spectrometry, and in the solid state, as proved by single-crystal X-ray analysis. The complexation between DP30C10 and N,N'-dimethyl-2,7-diazapyrenium bis(hexafluorophosphate) was also investigated, and was found to have an association constant of 8.2?x?103 M1 in acetonitrile. Based on this recognition motif, a dual-action acid/base and base/acid-controllable molecular switch was demonstrated. |
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