新荧光试剂5－（4＇－硝基－2＇－羧基苯偶氮）－4－氧代－2－硫代四氢噻唑的合成及分析应用研究

本文报道了新荧光试剂５－（４＇－硝基－２＇－羧基苯偶氮）－４－氧代－２－硫代四氢噻唑（４ＮＣＰＯＢＴ）的合成及其荧光分析应用。确证了其结构。研究了荧光性质，发现该试剂在溴代十六烷基吡啶存在下，在无水乙醇溶液中与Ｅｕ（Ⅲ）形成稳定的荧光螯合物，其线性范闲为１０×１０￣（－８）～１０×１０￣（－６）ｍｏｌ／Ｌ，检测限为１．５×１０￣（－１０）ｍｏｌ／Ｌ。测定了人工合成样品中的铕，结果满意。

Synthesis of a New Fluorescent Reagent 5-(4;-Nitro-2-Carboxylphenylazo-4-Oxo-2-Thiotetrahydrothiazole and Its Appilcation

The synthesis, fluorimetric analysis and application of 5-(4'-nitro-2'-carboxylphenylazo)-4-oxo-2-thiotetrahydrothiazoles(4NCPOST)are reported. The product has Been characterized by elemental analysis, IR,NMR and MS. Its fluorescence properties were studied. In the presenceof the bromohexadecylpyridine and in abso-lute alcohol, 4NCPOST reacts with europium(III)to form a stable chelate. the fluorescenceintensity was a linear function of the concentration of europium in the range of The de-tection limit was The proposed method has been applied to the determination of trace europium in artificial mixed samples with satisfactor results.