钯-8-羟基喹啉-5-磺酸络合物电极反应和十二烷基硫酸钠的增敏机理  

The Electrode Reaction of PalladiumⅡ-8-Hydroxyquinoline-5-sulfonic Acid and the Enhancement Mechanism of Sodium Dodecyl Sulfate

作　　者：邹洪[1] 张妮娜[1] 郭启华[1] 钱春燕[1] 朱若华[1] 谷学新[1] 

机构地区：[1]首都师范大学化学系.北京 100037

出　　处：《分析化学》2002年第4期406-410,共5页Chinese Journal of Analytical Chemistry

基　　金：北京市教委基金;北京市自然科学基金资助项目 (No .22972003 )

摘　　要：钯 8 羟基喹啉 5 磺酸形成的络合物的峰电流 (pH 8.6 ,- 0 .6 8V)具有吸附特性 ,为不可逆电极反应过程。其电子转移数 (n)、电子转移系数 (α)及饱和吸附量 (Γs)分别为 2、0 .4 6和 2 .2× 10 - 9mol cm2 ;钯 与8 羟基喹啉 5 磺酸的络合比为 1∶2 ;稳定常数 (K)为 8.73× 10 7。加入阴离子表面活性剂十二烷基硫酸钠未形成三元络合物 ,催化电流是由与十二烷基硫酸钠共吸附在电极表面上的超氧阴离子自由基氧化了络合物的电极反应中间体所产生的。The experimental results demonstrated that the peak current of Pd? 8 hydroxyquinoline 5 sulfonic acid (8 OXSA) [pH 8.6, E p -0.68 V( vs . SCE)] behaved an adsorptive character and an irreversible process of electrode reaction, the number of electron ( n ), the transfer coefficient ( α ) and the amount of saturated adsorption ( Γ s) were 2,0.46 and 2.2×10 -9 mol/cm 2, respectively. It was shown that Pd? formed a complex with 8 OXSA with the mole ratio of 1∶2, the conditional stability constant was calculated to be 8.73×10 7. Tertiary complex did not form after adding sodium dodecyl sulfate (SDS). Because SDS and superoxide anion radical adsorbed on the electrode surface, the reactive intermediate of Pd? 8 OXSA was oxidied by superoxide anion radical and the peak current of the complex was enhanced.

关 键 词：钯 8-羟基喹啉-5-磺酸 络合物 电极反应 十二烷基硫酸钠 增敏机理 

分 类 号：O646.5[理学—物理化学]