Exploiting click reaction as the key step, azo-coupled macrocyclic colorimetric chemosensors 4a and 4c were synthesized for metal ion sensing. Among metal ions examined, only Hg2+ can induce color change from orange to pale yellow detectable by the naked-eye for both sensors. The bind mode of the complex was established by spectrophotometric and NMR titrations.

中文翻译：

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一种易于组装，点击生成的大环发色团作为汞（II）传感器

利用点击反应作为关键步骤，合成了偶氮偶合的大环比色化学传感器4a和4c用于金属离子感测。在所检测的金属离子中，只有Hg2 +可以通过肉眼对两个传感器诱导的颜色从橙色变为浅黄色。通过分光光度法和NMR滴定建立复合物的结合模式。