摘要/Abstract

众所周知，氰根离子（CN^-）是最具有毒性的阴离子之一，它能够对环境和生物体造成很多不良的影响，因此，研究氰根离子的检测方法是非常有必要的，尤其是在水中以及食物中进行检测.然而，由于游离态的氰根离子半衰期短，但很多氰根离子检测方法所需分析时间较长并且容易受到其他阴离子的干扰，这些都成为精确检测氰根离子的挑战.利用氰根离子特殊的亲核性，合成了一个基于萘并呋喃酰氯和2-氨基苯并咪唑的新型传感器分子Q1-2，其设计原理在于通过调节分子内的氢键来影响分子的π-共轭效应.当加入氰根离子之后，传感器Q1-2的紫外光谱出现红移现象，并且荧光也立刻猝灭.计算得到该传感器通过紫外和荧光检测氰根离子的最低检测限分别为8.0769×10^-7和1.0510×10^-9 mol/L.其他共存的阴离子几乎不能干扰该识别过程.不仅如此，Q1-2可成功地应用于可见光和365 nm紫外灯照射下，肉眼识别食物样品中和硅胶板上的氰根.
关键词: 双通道检测, 氰根, 食物样品, 硅胶板
It is well-known that cyanide anion (CN^-) is a hypertoxic anion, which can cause adverse effects in both environment and living beings. Thus, it is highly desirable to develop strategies for detecting cyanide, especially in aqueous medium and food. However, due to the short half-life of free cyanide, long analysis time and interference from other competitive anions are general challenges for accurate monitoring of cyanide. Taking advantage of the special nucleophilicity of cyanide, a new colorimetric and fluorescent sensor (Q1-2) was synthesized based on naphtho[2,1-b]furan-2-carbonyl chloride and 2-aminobenzimidazole which designed by tuning the intramolecular hydrogen bonding to affect the π-conjugated efficiency. Upon the addition of cyanide anion, the probe displayed a red-shift in absorption spectra and the fluorescence decreased immediately with the detection limit of 8.0769×10^-7 and 1.0510×10^-9 mol/L, respectively. Other anions gave nearly no interference. Furthermore, Q1-2 was successfully applied to the naked eye identification for cyanide in the visible light and under the UV lamp in food samples and silica gel plates.
Key words: dual-channel detection, cyanide, food sample, silica gel plate


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