新试剂3-对氟苯基-5-(2′-羧基苯偶氮)若丹宁的合成及荧光法测定铋  

Synthesis of Α New Reagent 3-(4′-Fluorophenyl)-5-(2′-Carboxylphenylazo)-Rhodanine and the Fluorescent Determination of Bismuth(Ⅲ)

作　　者：于京华[1] 欧庆瑜[2] 李涛[1] 王来国[1] 

机构地区：[1]济南大学化学化工学院,济南250022 [2]中国科学院兰州化学物理研究所,兰州730000

出　　处：《分析化学》2004年第5期644-646,共3页Chinese Journal of Analytical Chemistry

基　　金：山东省自然基金资助项目 (No .Y2 0 0 3B0 1)

摘　　要：合成了新型试剂 3 对氟苯基 5 ( 2′ 羧基苯偶氮 )若丹宁 ,并经元素分析、IR确证了其结构。研究发现在 pH =5 .2时该试剂与痕量铋 (Ⅲ )形成的螯合物可使试剂的荧光强度大大减弱 ,在λex/λem =30 5nm/40 4nm处有最大峰 ;其荧光猝灭值与铋的浓度在 1.0～ 12 μg/L范围内呈线性关系 ,检出限达 0 .2 6μg/L。建立了荧光光度法测定痕量铋的新方法。A new fluorescent reagent, 3-(4′-fluorophenyl)-5-(2′-carboxylphenylazo)-rhodanine was synthesized. The structure of the reagent has been identification by elemental analysis and infrared spectroscopy. At pH 5.2, The reagent can react with trace bismuth(Ⅲ) to form a chelate which reduces the fluorescent intensity greatly. And when λ ex /λ em =305 nm/404 nm, the quenching effect is intensive. The decrease of fluorescence intensity has a linear relationship against concentration of bismuth (Ⅲ) in the range of 1.0～12 mg/L. The detection limit for Bi(Ⅲ) is 0.26 μg/L. A new method of fluorometric determination of bismuth(Ⅲ) was developed.

关 键 词：3-对氟苯基-5-(2'-羧基苯偶氮)若丹宁 荧光分析法 铋 测定方法 pH 荧光强度 分光光度法 

分 类 号：TQ421[化学工程] O657.3[理学—分析化学]