Imato Keiichi, Enoki Toshiaki, Ooyama Yousuke
Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima 739-8527 Japan
RSC Adv. 2019 Oct 3;9(54):31466-31473. doi: 10.1039/c9ra07136a. eCollection 2019 Oct 1.
An optical sensor with the ability to detect and determine water over a wide concentration range is highly desirable in the laboratory and industry. Here the sensitivity and spectral responses of an intramolecular charge transfer-type colorimetric and fluorescence sensor with β-carboline structure are tuned and improved significantly over various water contents in the organic solvent by fusion with an electron-donating juloidine structure and complexation with boron trifluoride (BF). The sensors, ET-1 and ET-1-BF, developed in this study can respond differently depending on water content. ET-1-BF releases BF to generate ET-1 by addition of a trace amount of water, and ET-1 forms hydrogen bonds with one water molecule in low water contents and a hydrogen-bonded proton transfer complex with several water molecules in high water contents, accompanying gradual color and fluorescence changes. This work shows a promising approach to the sensitive detection and precise determination of water over the whole concentration range using a simple and practical method with optical sensors.
在实验室和工业领域，非常需要一种能够在很宽的浓度范围内检测和测定水的光学传感器。在此，通过与供电子的朱罗啶结构融合并与三氟化硼（BF）络合，一种具有β-咔啉结构的分子内电荷转移型比色和荧光传感器在有机溶剂中的各种含水量下，其灵敏度和光谱响应得到了显著的调节和改善。本研究中开发的传感器ET-1和ET-1-BF可根据含水量的不同做出不同反应。加入微量水时，ET-1-BF释放BF生成ET-1，ET-1在低含水量时与一个水分子形成氢键，在高含水量时与几个水分子形成氢键质子转移复合物，同时伴随着颜色和荧光的逐渐变化。这项工作展示了一种利用光学传感器通过简单实用的方法在整个浓度范围内灵敏检测和精确测定水的有前景的方法。
