【作者】 刘俊杰； 邵元华；

【Author】 Junjie Liu;Yuanhua Shao;College of Chemistry and Molecular Engineering,Peking University;

【机构】 北京大学化学与分子工程学院；

【摘要】 两不相溶电解质溶液界面（简称为液/液界面）电化学研究对于相转移催化、药物释放等化学、生物学相关机理的阐述有着重要的意义^[1-3]。然而可用于液/液界面电化学研究的有机溶剂的缺乏给液/液界面电化学研究带来了较大的局限。本文发展了十二种可用于液/液界面电化学研究的脂肪酯溶剂。根据分子结构的不同,酯/水界面可提供较宽的电位窗（0.244V～0.566V）。本文研究了支持电解质对于电位窗的影响,探讨了决定电位窗离子的种类及分子结构对于电位窗的影响。基于发展的酯/水界面,进一步研究了TPAs⁺、ClO₄^-等简单离子在丙酸丁酯/水界面的简单离子转移反应及K⁺在丙酸丁酯/水界面上的加速离子转移反应,进而获得了相关离子在丙酸丁酯/水界面上转移的半波电位及Gibbs自由能等热力学数据。结果表明,与传统的有机溶剂1,2-二氯乙烷、硝基苯等相比,低毒性、廉价以及应用广泛等优点使得酯类有望成为液/液界面研究中一类新的可替代溶剂^[4]。更多还原

【Abstract】 An interface between two immiscible electrolyte solutions（ITIES） can be abbreviated as a liquid/liquid interface（L/L interface）.A wide variety of applications such as phase transfer catalysis,synthesis at the interface,solvent extraction and mimicking biomembranes in multidisciplinary are based on the platform of L/L interfaces.However,the lack of organic solvents at the L/L interface greatly restricts the development of L/L interface electrochemistry.A novel type of organic solvent,known as ester,being low-toxic,used widely in organic reaction,extraction,food additives and so forth,is reported to establish the novel L/L interfaces supported on micropipettes.Cycle voltammograms were collected at twelve ester/water interfaces,quantification of which suggested the ester/water interface could offer different potential windows varied from 0.244 to 0.566 V due to the difference of molecular structure.Based on these measurements,we concluded the potential window increased generally as the decrease of the concentration of LiCl in aqueous phase and increase of hydrophobicity of molecular structure.Moreover,the novel ester/water interfaces could provide a platform for simple ion transfer（IT） such as TPAs⁺,ClO₄^- and facilitated ion transfer（FIT） of K⁺,confirming a possibility to study IT reaction and evaluate thermodynamic parameters at a L/L interface.On account of the existing electrochemical research,the esters are promising to be alternative organic solvents for investigation of charge（ion and electron） transfer at a L/L interface as the advantage of low toxicity and low price.更多还原