Department of Chemistry, Wuhan University, Wuhan 430072, PR China.
Chemistry. 2011 Jun 20;17(26):7276-81. doi: 10.1002/chem.201003275. Epub 2011 May 19.
Two new highly selective colorimetric chemosensors for Hg(2+), based on azobenzene and highly selective Hg(2+)-promoted deprotection of a dithioacetal have been designed and synthesized. In the presence of as little as 20 μM Hg(2+), the sensors change their color from light yellow to deep red, which can easily be observed by the naked eye. The underlying signaling mechanism is intramolecular charge transfer (ICT). The sensors have good selectivity for Hg(2+) with respect to several common alkali, alkaline earth, and transition metal ions. Furthermore, they can be used for in-the-field measurements by virtue of a dipstick approach without any additional equipment.
两种基于偶氮苯和高度选择性的 Hg(2+) 促进的二硫缩醛去保护的新型高选择性比色化学传感器已被设计和合成。在存在低至 20μM Hg(2+)的情况下，传感器的颜色从浅黄色变为深红色，这可以通过肉眼轻松观察到。潜在的信号机制是分子内电荷转移 (ICT)。与几种常见的碱金属、碱土金属和过渡金属离子相比，传感器对 Hg(2+) 具有良好的选择性。此外，由于采用了比色条方法，无需任何额外的设备，它们可以用于现场测量。
