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Effect of Ionic Liquid Structure on the Electrochemical Response of Dopamine at Room Temperature Ionic Liquid‐modified Carbon Paste Electrodes (IL–CPE)
Electroanalysis ( IF 2.7 ) Pub Date : 2020-05-10 , DOI: 10.1002/elan.201900701 Salvador G. Hernández‐Vargas 1 , Carlos Alberto Cevallos‐Morillo 1 , Julio C. Aguilar‐Cordero 1
Electroanalysis ( IF 2.7 ) Pub Date : 2020-05-10 , DOI: 10.1002/elan.201900701 Salvador G. Hernández‐Vargas 1 , Carlos Alberto Cevallos‐Morillo 1 , Julio C. Aguilar‐Cordero 1
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In this work 12 different ionic liquids (ILs) have been used added as co‐binders in the preparation of modified carbon paste electrodes (IL–CPEs) used for the voltammetric analysis of dopamine in Britton‐Robinson buffer. The ionic liquids studied were selected based on three main criteria: (1) increasing chain length of alkyl substituents (studying 1‐ethylimidazolium and ethyl, propyl, butyl, hexyl and decylmethylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids); (2) nature of the counter ion (dicyanamide, bis(trifluoromethylsulfonyl)imide and hexafluorophosphate) in 1‐butyl‐3‐methylimidazolium ionic liquids; and (3) cation ring structures (1‐butyl‐3‐methylimidazolium, 1‐butyl‐1‐methylpiperidinium, 1‐butyl‐1‐methylpyrrolidinium and 1‐butyl‐3‐methylpyridinium) in bis(trifluoromethylsulfonyl)imide or hexafluorophosphate (1‐butyl‐3‐methylimidazolium or 1‐butyl‐3‐methylpyridinium as cations) ionic liquids. The use of IL as co‐binders in IL–CPE results in a general enhancement of both the sensitivity and the reversibility of dopamine oxidation. In square wave voltammetry experiments, the peak current increased up to a 400 % when 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide was used as co‐binder, as compared to the response found with the unmodified CPE. Experimental data provide evidence that electrostatic and steric effects are the most important ones vis‐à‐vis these electrocatalytic effects on the anodic oxidation of dopamine on IL–CPE. The relative hydrophilicity of dicyanamide anions reduced the electrocatalytic effects of the corresponding ionic liquids, while the use of 1‐ethyl‐3‐methylimidazolium hexafluorophosphate or 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide (two relatively small and highly hydrophobic ionic liquids) as co‐binders in IL–CPE resulted in the highest electrocatalytic activity among all of the IL–CPE studied.
中文翻译：
离子液体结构对多巴胺在室温下离子液体修饰的碳糊电极（IL–CPE）上的电化学响应的影响
在这项工作中，在改性碳糊电极（IL-CPE）的制备中使用了12种不同的离子液体（IL）作为共粘合剂，用于在Britton-Robinson缓冲液中多巴胺的伏安分析。根据以下三个主要标准选择研究的离子液体：（1）增加烷基取代基的链长（研究1-乙基咪唑鎓和乙基，丙基，丁基，己基和癸基甲基咪唑双（三氟甲基磺酰基）酰亚胺离子化液体）；（2）1-丁基-3-甲基咪唑鎓离子液体中抗衡离子（双氰胺，双（三氟甲基磺酰基）酰亚胺和六氟磷酸酯）的性质; （3）阳离子环结构（1-丁基-3-甲基咪唑鎓，1-丁基-1-甲基哌啶鎓，双（三氟甲基磺酰基）亚胺或六氟磷酸盐（1-丁基-3-甲基咪唑鎓或1-丁基-3-甲基吡啶鎓阳离子）离子液体中的1-丁基-1-甲基吡咯烷鎓和1-丁基-3-甲基吡啶鎓。在IL–CPE中将IL用作共结合剂可普遍提高多巴胺氧化的敏感性和可逆性。在方波伏安法实验中，与未改性的CPE的响应相比，当使用1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺作为共粘合剂时，峰值电流增加了400％。实验数据提供了证据，相对于这些对IL–CPE上多巴胺的阳极氧化的电催化作用，静电和空间位阻是最重要的。
更新日期：2020-05-10
中文翻译：
离子液体结构对多巴胺在室温下离子液体修饰的碳糊电极（IL–CPE）上的电化学响应的影响
在这项工作中，在改性碳糊电极（IL-CPE）的制备中使用了12种不同的离子液体（IL）作为共粘合剂，用于在Britton-Robinson缓冲液中多巴胺的伏安分析。根据以下三个主要标准选择研究的离子液体：（1）增加烷基取代基的链长（研究1-乙基咪唑鎓和乙基，丙基，丁基，己基和癸基甲基咪唑双（三氟甲基磺酰基）酰亚胺离子化液体）；（2）1-丁基-3-甲基咪唑鎓离子液体中抗衡离子（双氰胺，双（三氟甲基磺酰基）酰亚胺和六氟磷酸酯）的性质; （3）阳离子环结构（1-丁基-3-甲基咪唑鎓，1-丁基-1-甲基哌啶鎓，双（三氟甲基磺酰基）亚胺或六氟磷酸盐（1-丁基-3-甲基咪唑鎓或1-丁基-3-甲基吡啶鎓阳离子）离子液体中的1-丁基-1-甲基吡咯烷鎓和1-丁基-3-甲基吡啶鎓。在IL–CPE中将IL用作共结合剂可普遍提高多巴胺氧化的敏感性和可逆性。在方波伏安法实验中，与未改性的CPE的响应相比，当使用1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺作为共粘合剂时，峰值电流增加了400％。实验数据提供了证据，相对于这些对IL–CPE上多巴胺的阳极氧化的电催化作用，静电和空间位阻是最重要的。
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