5-[(对甲基苯基)偶氮]-8-氨基喹啉的合成及其与钯显色反应的研究  

Studies on synthesis of 5-[(4'-methyl)-phenylazo]-8-aminoquinoline(p-MPAQ)and colour reaction with palladium(Ⅱ)

作　　者：石国荣[1] 杨桂法 

机构地区：[1]湖南大学化学化工系,长沙410082

出　　处：《化学试剂》1992年第2期85-87,120,共4页Chemical Reagents

摘　　要：合成了新试剂5-[(对甲基苯基)偶氮]-8-氨基喹啉(p-MPAPO),并作了元素组成、红外光谱和薄板层析等分析鉴定。详细研究了新试剂在溴化十四烷基吡啶(TPB)存在下,在弱酸性介质中与钯的显色行为。p-MPAO 与钯形成1:1的紫色配合物。配合物的最大吸收峰位于565 nm 处,相应的表观摩尔吸光系数为ε_(565)=5.4×10~4L·mol_(-1)·cm^(-1)。。钯量在0～21μg/10 mL 内服从比耳定律。方法简便、快速、选择性好,可直接用于钯催化剂和废水中微量钯的测定。A new reagent p-MPAQ was synthesized.The acid dissociation constant of p-MPAQ was determined by spectrophotometry.At pH 1.8,Pd(Ⅱ)forms a purple complex with p-MPAQ.The maximum absorbance was measured at 565nm.The complex ratio of Pd(Ⅱ)to p-MPAQ is1:1.The molar absorptivity is 5.4×10~4L·mol^(-1)·cm^(-1).Beer's law is obeyed for 0～21μg Pd(Ⅱ)/10mL.The selectivity of the method is high.The method has been used to directly determinetrace palladium in catalyst and waste water with-out any masking agent.

关 键 词：钯 P-MPAQ 显色反应 

分 类 号：O614.823[理学—无机化学]