Fluoride indicator that functions in mixed aqueous media: hydrogen bonding effects
作者:Ananta Kumar Atta、In-Ho Ahn、Ah-Young Hong、Jungseok Heo、Chan Kyung Kim、Dong-Gyu Cho
DOI:10.1016/j.tetlet.2011.11.099
日期:2012.2
A urea-based fluoride anion indicator, 3, that functions in mixed aqueous media is reported. Under these conditions, indicator 3 and the two control systems 1 and 2 are colorless. Addition of fluoride anions produces an easy-to-visualize colorimetric response (colorless to yellow) in the case of 3, but not 1 or 2 as the result of anion-induced Si–O bond cleavage. Most of the colorimetric response is
据报道,在混合水性介质中起作用的基于脲的氟阴离子指示剂3。在这些条件下,指示器3和两个控制系统1和2是无色的。由于阴离子诱导的Si–O键断裂,在3的情况下添加氟化物阴离子会产生易于可视化的比色响应(无色至黄色),而在1或2的情况下则不会。据信大多数比色反应是由于氢键网络的改变,而不是π共轭途径本身的改变。