摘要
合成了新试剂 5 ,7-二溴〔杯 ( 4 )芳烃偶氮〕氨基喹啉 (DBCAQ) ,经红外光谱、元素分析和薄板层析检验其结构。研究了该试剂与Pd(Ⅱ )的显色反应的适宜条件。在pH =5 0的HAc -NaAc缓冲溶液中及非离子表面活性剂吐温 - 80存在下 ,试剂与Pd(Ⅱ )生成 1∶1的稳定配合物 ,建立了测定Pd(Ⅱ )的光度法新体系 ,该体系至少可稳定 1 0h ,λmax=680nm ,ε =8 2 6× 1 0 4 L/mol·cm ,Pd(Ⅱ )浓度在 0～ 35 μm/2 5ml内服从比耳定律。方法已用于钯催化剂中Pd(Ⅱ )的测定 ,结果与原子吸收法 (AAS)结果相符。
A new color reagent of 5,7-dibromo〔calix(4)arene〕aminoquinoline(DBCAQ)was synthesized.The product was checked by infrated spectroscopy,elemental analysis and thin layer chromatography.The optimum condition for the color reaction of DBCAQ and Pd(Ⅱ) was studied.In the presence of nonionic surfactant Tween-80 and in buffer solution of pH=5 0 HAc-NaAc,Pd(Ⅱ) reacts with DBCAQ to form a stable complex with n DBCAQ ∶n Pd(Ⅱ) =1∶1.A new spectrophotometric method for the determination of Pd(Ⅱ) has been established.The system can keep stabilizing at least 10 hours.The maximum absorption is at 680nm with molar absorptivity of 8 26×10 4L/mol·cm.Beer's law is obeyed in the range of 0～35μg/25ml for Pd(Ⅱ).The method has been applied to the determination of Pd in palladium catalysts.The results are in agreement with those provided by AAS.
出处
《贵金属》
CAS
CSCD
2002年第3期48-50,61,共4页
Precious Metals
基金
云南省教育厅科学研究基金项目 (991114 7)
关键词
显色反应
二溴氨基喹啉
钯
光度法
dibromo〔calix(4)arene〕aminoquinoline
Palladium
Spectrophotometric
