基于吲哚克酮酸染料的Ag 比色/荧光识别探针

Indolium Croconine-based Colorimetric and Fluorescent Chemosensor for Detection Ag

摘要:

以纳米氧化铜为催化剂合成了克酮酸，它与2,3,3-三甲基-3H吲哚经缩合反应得到吲哚克酮酸染料（ICR），利用紫外-可见（UV-Vis）吸收光谱考察了其对Na 、K 、Mg2 、Ca2 、Ni2 、Mn2 、Zn2 、Ag 和Ba2 的阳离子识别作用，结果表明，当加入Ag 时，ICR的乙醇-水溶液[V(C2H5OH):V(H2O)=4:1]吸光度降低，且溶液颜色由橄榄绿色变为橘黄色，而加入其它阳离子则无变化。同时，研究了Ag 对ICR的乙醇-水溶液[V(C2H5OH):V(H2O)=4:1]荧光发射光谱的影响，同样发现只有Ag 能使其荧光强度猝灭，显示了ICR对Ag 具有较高的选择性及灵敏性。此外，利用循环伏安法和1H NMR探究了该化合物对Ag 的识别作用机理。

Abstract:

Indole croconium dye was obtained by the condensation reaction between 2,3,3-trimethylindolenine and croconic acid prepared using copper oxide as a catalyst．The binding properities of the receptors with cations such as，Na 、K 、Mg2 、Ca2 、Ni2 、Mn2 、Zn2 、Ag and Ba2 were investigated by UV-Vis spectroscopy．The results showed that the absorbance obviously decreased upon the addition of Ag to ICR ethanol/water (4:1，V/V)．Moreover，a clear color from olive green to orange．Meanwhile，the fluorescence spectra of ICR ethanol/water (4:1，V/V) were investigated with adding increasing concentration of Ag ion．It was found that the fluorescence strength of ICR ethanol/water (4:1，V/V) was quenched．The results indicated that ICR exhibited high selective and sensitive recognition towards Ag ．The cyclic voltammetry and 1H NMR were also used for the recognition study of ICR to transition metal ions．