Reversible chemical reactions as the basis for optical sensors used to detect amines, alcohols and humidity
作者:Gerhard J. Mohr、Daniel Citterio、Caspar Demuth、Marc Fehlmann、Luzi Jenny、Christian Lohse、Allen Moradian、Tomas Nezel、Markus Rothmaier、Ursula E. Spichiger
DOI:10.1039/a901961h
日期:——
A new class of indicator dyes for use in analytical chemistry is presented. In contrast to most existing indicator dyes, which change colour upon complexation or protonation/deprotonation, the dyes presented here perform reversible chemical reactions with the analyte, resulting in changes in absorbance or fluorescence. Specifically, azo and stilbene dyes which exhibit a reactive trifluoroacetyl group, reversibly interact with alcohols, amines or water to give the respective diol, hemiaminal, hemiacetal or zwitterion. Indicator dyes that combine the properties of a chemical reagent and a ligand molecule are termed ‘chromo-’ or ‘fluororeactands’. They are embedded in various polymer materials and have been characterised for the optical sensing of aliphatic amines, alcohols and humidity. Furthermore, methacrylate derivatives of the dyes have been tested. They were prepared to link the dyes covalently to the polymer matrix. The optical and physical properties of the dye methacrylates make them promising candidates not only for optical sensing but also for applications in molecularly imprinted polymers and non-linear optics.
本文介绍了一类用于分析化学的新型指示染料。与大多数现有的指示染料(这些染料在络合或质子化/去质子化时会改变颜色)不同,本文介绍的染料与分析物进行可逆化学反应,从而导致吸光度或荧光的变化。具体而言,具有反应性三氟乙酰基的偶氮和苯乙烯染料与醇、胺或水可逆反应,生成相应的二醇、半亚胺、半缩醛或双离子。结合化学试剂和配体分子特性的指示染料称为“染色体”或“荧光反应剂”。它们嵌入各种聚合物材料中,并已用于对脂肪胺、醇和湿度的光学传感。此外,这些染料的甲基丙烯酸酯衍生物也已进行测试,以便将染料在共价连接到聚合物基体上。染料甲基丙烯酸酯的光学和物理特性使它们成为光学传感以及在分子印迹聚合物和非线性光学应用中的有前景候选者。