Thin-Film Voltammetry of a Lutetium Bisphthalocyanine at Ionic Liquid|Water Interface
Thin-Film Voltammetry of a Lutetium Bisphthalocyanine at Ionic Liquid|Water Interface
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离子液体|水界面镥双酞菁的薄膜伏安法
DOI：
10.1002/elan.201000491
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发表时间：
2011
期刊：
影响因子：
3
通讯作者：
E. Ngameni
中科院分区：
文献类型：
--
作者：
A. Nassi;Christophe Thiery Ebelle;E. Njanja;E. Ngameni
在室温下，溴化四辛基膦是一种粘性离子液体，这种凝胶状有机相可以浇铸在基面石墨电极（BPGE）上。在这样的修饰电极，在与水溶液接触的循环伏安法已经揭示了一个可逆的氧化和五个可逆的还原步骤的LuIII双酞菁溶解在离子液体膜中，高反应性的还原物种的保护，从与水在这个高度亲脂相的相互作用的证据。还表明，氧化还原性质受水相中离子的影响，该性质归因于离子配对效应;显然，离子在有机相中转移，|水界面被忽略。Lu（III）[（tBu）4Pc]2在类似条件下的电化学（循环伏安法和方波伏安法）表明，与离子液体膜接触的水溶液中的阴离子的性质和浓度影响电极反应的电势。这可以归因于界面电位的变化，也因为有机相是阴离子交换剂。此外，SWV实验表明，总反应的速率随水性电解质的阴离子的性质和浓度而变化，这意味着离子通过有机电解质的转移。|水界面的电子交换速率比石墨表面分子的电子交换速率慢。
At room temperature, tetraoctylphosphonium bromide is a viscous ionic liquid, this gel-like organic phase can be cast over a basal-plane graphite electrode (BPGE). Cyclic voltammetry at such a modified electrode, in contact with an aqueous solution have revealed one reversible oxidation and five reversible reduction steps for a LuIII bisphthalocyanine dissolved in the ionic liquid film, a proof that the highly reactive reduced species were protected from interaction with water in this highly lipophilic phase. It has also been shown that the redox properties are influenced by the ions in the aqueous phase, a property which has been attributed to ion-pairing effects; obviously, the ion transfers at the organic|aqueous interface has been ignored. Electrochemistry of Lu(III)[(tBu)4Pc]2 (cyclic voltammetry and square wave voltammetry) under similar conditions shows that the nature and concentration of the anion in the aqueous solution in contact with the ionic liquid film influences the potential of the electrode reaction. This can be attributed to variations of the interfacial potential and also because the organic phase is an anion exchanger. Moreover, SWV experiments suggest that the rate of the overall reaction varies with the nature and concentration of the anion of the aqueous electrolyte, which implies that the ion transfer through the organic|aqueous interface is slower than the electron exchange rate of the molecule at the surface of graphite.