2-(4',5'-二甲基-2'-噻唑偶氮)-5-二甲氨基苯胺与钯反应的分光光度法研究

Spectrophotometric study of the reaction of palladium(Ⅱ)with 2-(4',5'-dimethy1-2'-thiazolylazo)-5-dimethylaminoaniline

以4,5-二甲基噻唑为母体合成了2-(4′,5′-二甲基-2′-噻唑偶氮)-5-二甲氨基苯胺。研究了试剂与钯反应的适宜条件。在1.2 mol/L 高氯酸溶液中,试剂与钯形成1:1的稳定青蓝色配合物。配合物的最大吸收波长位于648 nm。表观摩尔吸光系数ε_(648)=6.7×10~4。Pd(Ⅱ)的浓度在0～35μg/25 mL范围内符合比尔定律。多种离子不于扰,磷酸可掩蔽 Fe^(3+)的干扰。可用于含钯样品的分析,结果满意。

The method of synthesis and propertiesof 2-(4′,5′-dimethyl-2′-thiazolylazo)-5-dimethyl-aminoaniline(DMTAA)have been reported,andthe optimum conditions for the spectrophotome-tric determination of palladium(Ⅱ)with DMTAAhave been described.In 1.2 mol/L perchloricacid medium palladium(Ⅱ)and DMTAA forma 1:1 stable complex.The complex has a maxi-mum absorption at 648 nm.Its molar absorptivityis 6.7×10~4L·mol^(-1)·cm^(-1).Beer's law is obeyed for0～35 μg/25 mL of palladium(Ⅱ)The methodhas been successfully applied to determine tracepalladium with satisfactory results