一种双苯并噁唑-三苯胺荧光探针的合成及其对Fe^3+的检测

Synthesis of a novel bisbenzoxazole-triphenylamine fluorescent probe and the application for Fe^3+ determination

以邻氨基苯酚、丙二酸和三苯胺为原料,合成了一种具有D-π-A结构的荧光探针材料1,1-双(苯并噁唑-2-基)-2-(三苯胺-4-基)乙烯(T),收率59.7%。采用FT-IR,1H NMR及13C NMR表征了产物的分子结构。通过UV-Vis、溶液和固体荧光考察了T的光物理性能,测试了p H对T溶液荧光性能的影响,研究了T对金属离子(Na^+,Mg^2^+,Al^3^+,K^+,Ca^2^+,Cr^3^+,Mn^2^+,Fe^3^+,Co^2^+,Ni^2^+,Cu^2^+,Zn^2^+,Ag^+,Cd^2^+,Hg^2^+,Pb^2^+)的探针检测能力。结果表明:T的溶液和固体荧光分别为λe m=495,535 nm处的蓝绿色和黄绿色荧光,量子产率和0.41。在DMF中Fe^3^+对T具有显著的荧光猝灭效应,共存离子无显著干扰。在0.10~1.20μmol/L范围内,探针对Fe^3^+的荧光检测具有良好的定量线性关系,检测限为13 nmol/L。Job曲线法测试表明T对Fe^3^+的荧光识别机理为二者形成了1:1摩尔比的配离子。

A novel D-π-A type fluorescent probe material 1,1-bis(benzoxazole-2-yl)-2-(triphenylamine-4-yl)ethylene(T)was synthesized by using o-aminophenol,malonic acid and triphenylamine,the productivity was59.7%.The molecular structure was characterized by FT-IR,1H and13C NMR.The photophysical properties of the T were investigated by UV-Vis,solution and solid fluorescence,meanwhile,the effect of p H on the solution fluorescence of the T was assessed.The recognition capability of the T to metal cations(Na^+,Mg^2^+,Al^3^+,K^+,Ca^2^+,Cr^3^+,Mn^2^+,Fe^3^+,Co^2^+,Ni^2^+,Cu^2^+,Zn^2^+,Ag^+,Cd^2^+,Hg^2^+,Pb^2^+)was studied.The results indicated that the fluorescence of the aqueous and solid T espectively showed in blue-green and yellowgreen at theλemof 495 and 535 nm with the FL quantum yield of 0.41.The ferric ion(Fe^3^+)possesses remarkable quenching effect on the T in DMF,without interfere of the co-existing ions.The fluorescence probe possessed favourable linear relationship with the Fe^3^+in the range of 0.10-1.20μmol/L(R2=0.9982),and the limit of detection was 0.013μmol/L.The Job’s plot demonstrated that the recognition mechanism of the T to Fe^3^+is based on the forming of a complex ion at 1:1 molar ratio.