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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A novel fluorescence 'on-off-on' chemosensor for Hg2+ via a water-assistant blocking heavy atom effect
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A novel fluorescence 'on-off-on' chemosensor for Hg2+ via a water-assistant blocking heavy atom effect

机译：一种新型的Hg2 +荧光“开-关-开”化学传感器，通过水助阻重原子效应

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摘要

Upper rim pyrene-functionalized hexahomotrioxacalix[3] arene L was synthesized via Click chemistry, and its fluorescence behaviors toward several common metal cations were investigated. L exhibited a significant fluorescence quenching response to Hg2+ in CH3CN solution, which was unaffected by the coexistence of other competitive metal cations. Thus, L can be utilized as a highly selective and sensitive fluorescent chemosensor for Hg2+ with a detection limit in the nM level. Interestingly, the quenched fluorescence emission can be successfully revived upon the addition of water. In this process, the heavy atom effect of Hg2+ can be blocked by further coordination of a water molecule and resulted in the revival of the fluorescence emission of L/Hg2+ complex. Particularly, other polar solvents such as CH3OH and CH3CH2OH also have the ability to revive the fluorescence emission of the L/Hg2+ complex, but on a much smaller scale than observed for H2O. The heavy atom effect and blocking thereof were demonstrated within the same system by the use of a C-3-symmetric homooxacalix[3] arene scaffold. The present studies provided further evidence for the blocking heavy atom effect.
机译：通过点击化学合成了上缘官能化的六高三氧杂aca [3]芳烃L，并研究了其对几种常见金属阳离子的荧光行为。 L在CH3CN溶液中对Hg2 +表现出显着的荧光猝灭响应，不受其他竞争性金属阳离子的共存影响。因此，L可以用作Hg2 +的高度选择性和灵敏的荧光化学传感器，其检测极限为nM级。有趣的是，加入水后，猝灭的荧光发射可以成功恢复。在此过程中，Hg2 +的重原子效应可通过水分子的进一步配位来阻止，并导致L / Hg2 +络合物的荧光发射恢复。特别是，其他极性溶剂（例如CH3OH和CH3CH2OH）也具有恢复L / Hg2 +配合物的荧光发射的能力，但规模要比H2O小得多。在同一系统中，通过使用C-3对称的oxoxacalix [3]芳烃骨架，证明了重原子效应及其阻滞作用。本研究为阻断重原子效应提供了进一步的证据。

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