[23]Crown-7-ether incorporated [2]rotaxanes, comprising an anthracene blocker and 4-isopropylphenyl/cyclohexyl end groups, exhibited varying degrees of metastability with a range of chemical (base, halide anions) and physical (solvent, heat) stimuli. Among halides, fluoride, chloride, and bromide anions affected the deslippage of 23-crown-7-ether in 4-isopropylphenyl stoppered [2]rotaxane. Surprisingly, only fluoride anions could selectively induce deslippage in cyclohexyl stoppered [2]rotaxane, whose fluorescence quenching provided an additional tool to selectively detect the fluoride anions down to 2.49 × 10^–7 M.

中文翻译：

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调节多响应 [2] 轮烷中的塞子尺寸以实现氟阴离子选择性亚稳定性


[23]冠-7-醚掺入[2]轮烷，包含蒽阻断剂和4-异丙基苯基/环己基端基，在一系列化学（碱、卤化物阴离子）和物理（溶剂、热）下表现出不同程度的亚稳定性刺激。在卤化物中，氟、氯和溴阴离子影响23-冠-7-醚在4-异丙基苯基封端的[2]轮烷中的脱滑。令人惊讶的是，只有氟化物阴离子才能选择性地诱导环己基封端的[2]轮烷脱滑，其荧光猝灭提供了一种额外的工具来选择性检测低至 2.49 × 10 ^–7 M 的氟化物阴离子。