EQCM监测高氯酸溶液中金电极上苯二酚电荷转移配合物的沉积  

Electrodeposition of Dihydroxybenzene Charge-transfer Complexes on Au Electrodes in Aqueous HClO_4 Monitored by EQCM

作　　者：李云龙[1] 谢青季[1] 姚守拙[1] 

机构地区：[1]化学生物学及中药分析省部共建教育部重点实验室,湖南师范大学化学化工学院,长沙410081

出　　处：《应用化学》2007年第6期628-631,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(30300041;20675029)资助项目;中国科学院长春应用化学研究所电分析化学国家重点实验室开放基金;湖南省教育厅重点项目(05A036)资助

摘　　要：用电化学石英晶体微天平(EQCM)研究了高氯酸溶液中电位环扫过程中邻(间、对)苯二酚/醌电荷转移配合物(CTC)的生成和电沉积。结果发现,邻(对)苯二酚可产生CTC并在电极上沉积,而间苯二酚仅发生电聚合反应。以邻苯二酚为例考察了高氯酸和邻苯二酚浓度及电位扫描速度的影响。红外光谱证实了邻苯二酚/醌CTC的生成。结果发现,添加肝素钠对邻苯二酚/醌CTC的沉积有显著影响,肝素钠质量浓度分别低/高于0.05 g/L时,能增强/减弱沉积现象。EQCM技术可作为一种快速、简便、灵敏的工具可望用于CTC制备过程中的实时监测和筛选。Cyclic vohammetric oxidation of pyrocatechin, hydroquinone and resorcinol in aqueous HCIO4 was investigated for examination of the possible formation of charge-transfer complex （ CTC ） via electrochemical quartz crystal microbalance （EQCM） technique. CTC deposition occurred in HClO4 solutions containing pyrocatechin or hydroquinone of high concentrations, while resorcinol only polymerized under the same conditions. With the pyrocatechin system as an example, the effects of potential-sweep rate and concentrations of pyrocatechin and HClO4 were examined. FTIR data also supported the CTC formation of the pyrocatechin system. We also found that the addition of large-sized heparin sodium influenced significantly the CTC deposition. With the increase of heparin mass concentration, the CTC deposition was first enhanced significantly and then inhibited, and the turning point was at 0. 05 g/L heparin. The EQCM as a fast, convenient and sensitive tool is highly recommended for CTC-deposition investigations including the monitoring and screening during CTC syntheses.

关 键 词：电化学石英晶体微天平 电荷转移配合物 邻苯二酚 对苯二酚 间苯二酚 

分 类 号：O657.1[理学—分析化学]