3,5-diBr-PADAP与Cu、Co、Zn、Ni显色反应性能的研究

Studies on Chromogenic Reaction of Copper, Cobalt, Nickel and Zinc Ion with 3,5-Dibromo-2-(2-Pyridylazo)-s-Diethylamino-Phenol

本文系统地研究Cu^(2+)、Co^(2-)、Ni^(2+)、Zn^(2+)与3,5-diB-PADAP在水溶液-含氧有机溶剂介质中的反应行为,配合物的萃取性能,表面活性剂的作用及动力学特性。在水-乙醇介质中,Me与试剂均形成1:2的配合物,表现摩尔吸光系数分别为1.17×10~5,0.94×10~5、1.19×10^(-5)、1.25×10~5;在三氯甲烷等萃取溶济中,其表观摩尔吸光系数分别为1.6×10~5、0.94×10~5、1.03×10~5、0.89×10~5;表面活性剂能代替含氧有机溶剂,尤以阴离子-非离子混合表面活性剂效果最佳,其ε值分别为1.24×10~5、0.91×10~5、1.28×10~5、1.08×10~5。

The complex reaction of the title reagent (3,5-diBr-PADAP) with Cu, Co, Ni and Zn has been studied in detail. In water-alcohol medium the composition ratios of all metal ions to 3,5-diBr-PADAP in the complexes are all 1:2, and the molar absorptivities are respectively 1.17×10~5.0.94×10~5, 1.19×10~5 and 1.25×10~5 for Cu. Co, Ni and Zn. In extraction solvent such as trichloromethane the respective molar absorptivitles are 1.6×10~5, 0.94×10~5. 1.05×10~5 and 0.89×10~5. In the presence of surfactant preferably mixed anionnonionic 2surfactant, instead of organic oxysolvent,the respective molar absorptivities are 1.24×10~5,0.91×10~5, 1.28×10~5 and 1.08×10~5. The kinetics of sufractant are discussed.