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Brønsted acidity in deep eutectic solvents and ionic liquids
Faraday Discussions ( IF 3.3 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1039/c7fd00153c Andrew P. Abbott 1, 2, 3, 4, 5 , Sahar S. M. Alabdullah 1, 2, 3, 4, 5 , Azhar Y. M. Al-Murshedi 1, 2, 3, 4, 5 , Karl S. Ryder 1, 2, 3, 4, 5
Faraday Discussions ( IF 3.3 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1039/c7fd00153c Andrew P. Abbott 1, 2, 3, 4, 5 , Sahar S. M. Alabdullah 1, 2, 3, 4, 5 , Azhar Y. M. Al-Murshedi 1, 2, 3, 4, 5 , Karl S. Ryder 1, 2, 3, 4, 5
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Despite the importance of ionic liquids in a variety of fields, little is understood about the behaviour of protons in these media. The main difficulty arises due to the unknown activity of protons in non-aqueous solvents. This study presents acid dissociation constants for nine organic acids in deep eutectic solvents (DESs) using standard pH indicator solutes. The pKIn value for bromophenol blue was found by titrating the DES with triflic acid. The experimental method was developed to understand the acid–base properties of deep eutectic solvents, and through this study it was found that the organic acids studied were slightly less dissociated in the DES than in water with pKa values between 0.2 and 0.5 higher. pKIn values were also determined for two ionic liquids, [Bmim][BF4] and [Emim][acetate]. The anion of the ionic liquid changes the pH of the solution by acting as a buffer. [Emim][acetate] was found to be more basic than water. It is also shown that water significantly affects the pH of ionic liquids. This is thought to arise because aqueous mixtures with ionic liquids form heterogeneous solutions and the proton partitions into the aqueous phase. This study also attempted to develop an electrochemical pH sensor. It was shown that a linear response of cell potential vs. ln aH+ could be obtained but the slope for the correlation was less than that obtained in aqueous solutions. Finally it was shown that the liquid junction potential between two reference electrodes immersed in different DESs was dependent upon the pH difference between the liquids.
中文翻译：
在低共熔溶剂和离子液体中的布朗斯台德酸度
尽管离子液体在各种领域中都很重要，但对于这些介质中质子的行为知之甚少。主要困难是由于质子在非水溶剂中的未知活性而引起的。这项研究提供了使用标准pH指示剂溶质在深共熔溶剂（DES）中对九种有机酸的酸解离常数。溴酚蓝的p K In值是通过用三氟甲磺酸滴定DES得出的。实验方法的发展是为了理解深共熔溶剂的酸碱性质，并且通过这项研究发现，所研究的有机酸在DES中的离解比在水中的离解要少一些，p K a值在0.2到0.5之间。p ķ在还确定了两种离子液体[Bmim] [BF 4 ]和[Emim] [乙酸盐]的值。离子液体的阴离子通过充当缓冲剂来改变溶液的pH值。发现[Emim] [醋酸盐]比水更碱性。还显示出水显着影响离子液体的pH。认为这是由于与离子液体的水性混合物形成非均相溶液并且质子分配到水相中而引起的。这项研究还试图开发一种电化学pH传感器。结果表明，细胞电位的线性响应对LN 一个ħ +可以得到，但是相关的斜率小于水溶液中的斜率。最终表明，浸没在不同DES中的两个参比电极之间的液体结电势取决于液体之间的pH差。
更新日期：2017-12-15
中文翻译：
在低共熔溶剂和离子液体中的布朗斯台德酸度
尽管离子液体在各种领域中都很重要，但对于这些介质中质子的行为知之甚少。主要困难是由于质子在非水溶剂中的未知活性而引起的。这项研究提供了使用标准pH指示剂溶质在深共熔溶剂（DES）中对九种有机酸的酸解离常数。溴酚蓝的p K In值是通过用三氟甲磺酸滴定DES得出的。实验方法的发展是为了理解深共熔溶剂的酸碱性质，并且通过这项研究发现，所研究的有机酸在DES中的离解比在水中的离解要少一些，p K a值在0.2到0.5之间。p ķ在还确定了两种离子液体[Bmim] [BF 4 ]和[Emim] [乙酸盐]的值。离子液体的阴离子通过充当缓冲剂来改变溶液的pH值。发现[Emim] [醋酸盐]比水更碱性。还显示出水显着影响离子液体的pH。认为这是由于与离子液体的水性混合物形成非均相溶液并且质子分配到水相中而引起的。这项研究还试图开发一种电化学pH传感器。结果表明，细胞电位的线性响应对LN 一个ħ +可以得到，但是相关的斜率小于水溶液中的斜率。最终表明，浸没在不同DES中的两个参比电极之间的液体结电势取决于液体之间的pH差。
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