This paper reports the synthesis and characterization of metal-binding indicators with diverse optical responses on exposure to various heavy metal ions. A combinatorial approach, based on azo coupling of diazonium salts with either phenolic compounds or aromatic amines, generated a library of azo dyes. Each reaction mixture, containing the product(s) of azo coupling, was incubated with a series of solutions, each containing a different heavy metal ion. The absorbance and, in some cases, fluorescence spectra of the resulting complexes were recorded. The metal chelates showed extensive diversity in their UV−visible absorbance spectra upon binding to selected metal ions. Of the azo dyes prepared, the terdentate dyes were particularly useful, providing distinct spectral responses to three or more metal ions in a panel of seven.
本文报告了在暴露于各种重
金属离子时具有不同光学反应的
金属结合指示剂的合成和表征。基于重氮盐与
酚类化合物或芳香胺的偶氮偶联的组合方法产生了一个偶氮
染料库。将含有偶氮偶联产物的每种反应混合物与一系列溶液进行孵育,每种溶液都含有不同的重
金属离子。记录所得络合物的吸光度和某些情况下的荧光光谱。
金属螯合物与选定的
金属离子结合后,其紫外可见吸收光谱呈现出广泛的多样性。在制备的偶氮
染料中,三齿
染料特别有用,在七种
金属离子中,它们对三种或三种以上的
金属离子提供了不同的光谱响应。