1-(6-硝基-2-苯并噻唑)-3-(5-溴-8-喹啉)-三氮烯的合成及其与镍的显色反应

Synthesis of 1-(6-nitro-2-benzothiazolyl)-3-(5-bromo-8-quinolyl)-triazene and its color reaction with nickel

报道了新试剂1-（6-硝基-2-苯并噻唑）-3-（5-溴-8-喹啉）-三氮烯（NBTBQT）的合成、纯化、结构鉴定及性质，并研究了其与镍的显色反应。在PH9．5的硼砂-氢氧化钠缓冲介质中，在表面活性剂CTMAB存在下，试剂与镍形成2：1蓝色络合物，络合物最大吸收波长位于633nm，表观摩尔吸光系数为2．16×10^5L·mol^-1·cm^-1，镍的质量浓度在9～240μg／L范围内符合比尔定律，检出限为2．70×10^-9g／mL。方法应用于铝合金中镍的测定，相对标准偏差在1．2％～1.7％之间，测定结果与认定值相符。

A new triazene reagent 1-（6-nitro-2-benzothiazolyl）-3-（5-bromo-8-quinolyl）-triazene has been synthesized,purified and identified. The color reaction of this reagent with nickel has been studied. In the medium of Na2B4O7-NaOH buffer solution at pH 9. 50 and in the presence of surfactant cetyltrimethylammounium bromide （CTMAB）, the reagent reacted with nickel to form a stable blue complex with a molar ratio of 2 ： 1. The complex has a maximum absorption at 633 nm and the apparent molar absorptivity of the system is 2.16×10^5 L·mol^-1·cm^-1. Beer＇s law is obeyed in the range of 9-240μg/L for nickel. The detection limit is 2.70×10^-9 g/mL. The method has been applied to determine nickel in aluminum alloy samples and the results are consistent with the certified content with the RSD of 1.2%-1.7%.