Electrochemical modification of benzo-15-crown-5 ether on a glassy carbon electrode for alkali metal cation recognition
Electrochemical modification of benzo-15-crown-5 ether on a glassy carbon electrode for alkali metal cation recognition
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DOI：
10.1016/j.jelechem.2003.09.018
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发表时间：
2004-03-01
影响因子：
4.5
通讯作者：
Teramae, N
中科院分区：
文献类型：
--
作者：
Morita, K;Yamaguchi, A;Teramae, N
将苯并-15-冠-5(B15C5)共价固定在玻碳电极上，研究了其与碱金属阳离子的络合能力。制备了4‘-氨基苯并-15-冠-5与NaNO2的混合物，生成重氮化的B15C5，并将GC电极浸泡在混合物中。在0.0V~-0.8V的电压范围内，重氮化的B15C5被电化学还原，并与电极表面的碳原子反应，在GC电极上形成B15C5层。用循环伏安法和扫描隧道显微镜对B15C5层进行了表征。B15C5基团的表面量随着电势循环的重复而增加，在20个循环内达到饱和值。扫描电子显微镜观察表明，B15C5形成了单层或亚单分子层。用循环伏安法和交流阻抗法研究了碱金属离子在碳电极B15C5膜上的吸附行为。吸附常数顺序为K+&Gt；Na+&Gt；Rb+&Gt；Li+&Gt；Cs+，表明修饰电极表面K+与B15C5基团之间存在协同缔合作用。(C)2003爱思唯尔B.V.保留所有权利。
Benzo-15-crown-5 (B15C5) was covalently immobilized on a glassy carbon (GC) electrode and its complexation ability with alkali metal cations was studied. A mixture of 4'-aminobenzo-15-crown-5 and NaNO2 was prepared to generate diazotized B15C5, and a GC electrode was immersed in the mixture. By potential cycling between 0.0 and -0.8 V, the diazotized B15C5 was reduced electrochemically and reacted with the carbon atoms at the electrode surface to form the B15C5 layer on the GC electrode. Cyclic voltammetry and scanning tunneling microscopy were used to characterize the B15C5 layer. The surface amount of B15C5 groups increased by repeating the potential cycles, and reached a saturated value within 20 cycles. STM observation reveals that a monolayer or sub-monolayer of B15C5 was formed. The adsorption behavior of alkali metal cations to the B15C5 layer on GC electrode was examined by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The order of adsorption constants was K+ > Na+ > Rb+ > Li+ > Cs+, indicating cooperative association between K+ and B15C5 groups at the modified electrode surface. (C) 2003 Elsevier B.V. All rights reserved.