新试剂2,4-二溴-6-硝基苯基重氮氨基-4-苯基-2-噻唑的合成及与钯(Ⅱ)显色反应的研究

Synthesis of a New Reagent 2,4-dibromo-6- nitrophenyldiazoamino-4-phenyl-2-thiazole and Study on Its Coloration Reaction with Palladium(Ⅱ)

本文研究了新显色剂2，4-二溴-6-硝基苯基重氮氨基-4-苯基-2-噻唑（DB-o-NDAT）的合成及与把（II）的显色反应．在阳离子表面活性剂N-氯代十六烷基吡啶（CPC）存在下，于pH=6.0～8.0的KH2PO4-NaOH缓冲溶液中，把（II）与该试剂形成1：1的紫色配合物，其最大吸收峰位于600nm，摩尔吸光系数为5．3×104L·mol－1·Cm－1．钯（II）浓度在0～16μg／25ml范围内符合比尔定律，该试剂对钯的选择性良好，用于Pd-C催化剂及矿样中微量把（II）的测定，结果令人满意．

The paper describes the method of synthesis of 2,4－dibromo－6 nitrophenyldiazoamino－4－phenyl－2－thiazole (DB－o－NDAT),and studies the coloration reaction with Pd(II).In the presence of CPC and pH 6.0～8.0 KH2PO4 buffer solution,Pd(II) reacts with DB－o－NDAT to form a violet complex with a molar ratio of 1:1 .The complex has a maximum absorption at 600nm with a molar absorptivity of 5.3×104L·mol-1·cm-1. Beer's law is obeyed for 0～16μg/25ml.The method has been applied to determine Pd(II) in Pd－C catalyst and ore with satisfactory results.