Jaiswal Mukesh, Dasgupta Suvankar
Department of Chemistry, National Institute of Technology Patna, Patna 800005, India.
Org Lett. 2024 Aug 9;26(31):6776-6781. doi: 10.1021/acs.orglett.4c02544. Epub 2024 Jul 25.
[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 M.
[23]含有冠-7-醚的[2]轮烷，由蒽阻断剂和4-异丙基苯基/环己基端基组成，在一系列化学（碱、卤化物阴离子）和物理（溶剂、热）刺激下表现出不同程度的亚稳定性。在卤化物中，氟化物、氯化物和溴化物阴离子影响4-异丙基苯基封端的[2]轮烷中23-冠-7-醚的脱滑。令人惊讶的是，只有氟化物阴离子能选择性地诱导环己基封端的[2]轮烷发生脱滑，其荧光猝灭提供了一种额外的工具，可选择性地检测低至2.49×10⁻⁶ M的氟化物阴离子。
