5-苯基偶氮-8-(4-羧基苯偶氮氨基)喹啉与铜(Ⅱ)显色反应研究

Color Reaction of Copper (Ⅱ) With 5-Phenylazo-8-(4-carboxylphenyldiazoamido)quinoline

合成了5-苯基偶氮-8-(4-羧基苯偶氮氨基)喹啉(PACPAQ)。在pH8.2的硼砂缓冲介质中,在CTMAB存在下,铜(Ⅱ)与PACPAQ形成1:4紫红色络合物,λ_(max)为540nm,ε=6.9×10~4·L·mol^(-1)·cm^(-1),铜量在0～10μg/25ml范围内符合比尔定律.用于粗铅和水中铜的测定,结果满意。

5-Phenylazo-8-(4-carboxylphenyldiazoamido)quinoIine (PACPAQ) was synthesized. Copper (Ⅳ) reacts with PACPAQ to form a violet-red complex in the presence of cetyltrimethyl ammonium bromide, in the medium of Na2B4O7-HCl buffer. Its molar absorptivity is 6. 9×104 L·mol-1 · cm-1at 540 nm. Beer's law is obeyed over the range of 0-10μ/25 ml. This method has been applied to the determination of copper in lead and water.