取代苯酚在不同尺寸电极上的扫描速率和浓度依赖性,苯酚在不同溶剂中的扩散系数

IF 1.1 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
L. Kiss, S. Kunsági-Máté
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引用次数: 0

摘要

在这项工作中,研究了扫描速率和取代酚的浓度对峰值电流或电流平台的影响。在4-氯苯酚、4-叔丁基苯酚和4-硝基苯酚的不同实验条件下,铂微电极记录的伏安曲线变化显著。以4-甲氧基苯酚和4-叔丁基苯酚为例,在乙腈中较低浓度范围内进行实验时,平台电流和峰值电流与苯酚浓度呈线性关系。因此,这些范围为进一步表征提供了机会。4-甲氧基苯酚的电极反应在不同溶剂(水、乙腈、二甲基亚砜、二甲基甲酰胺、硝基苯、丙酮、二氯甲烷、甲醇、乙醇、1-丙醇、1-丁醇和1-戊醇)中呈扩散控制过程。采用稳态伏安法测定了4-甲氧基苯酚的扩散系数。其他酚类化合物仅用大电极在乙腈中测定扩散系数。与已知理论一致,扩散系数与溶剂粘度呈反比关系。在1-戊醇溶剂中需要特别注意,因为在第一次扫描后出现了增加的阳极峰,并与s型规则微电极伏安图重叠。这种观察结果可能是由于粘接残余电活性产物的形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Scan rate and concentration dependence of the voltammograms of substituted phenols on electrodes with different size, diffusion coefficients of phenols in different solvents
In this work, the effects of the scan rate and the concentration of the substituted phenols on the peak currents or current plateaus have been investigated. Voltammetric curves recorded by a platinum microelectrode varied significantly under different experimental conditions in cases of 4-chlorophenol, 4- tert-butylphenol, and 4-nitrophenol. In the case of 4-methoxyphenol and 4- tert-butylphenol, when the experiments were performed in the lower concentration range in acetonitrile, the plateau current and peak current showed linear dependence on phenol concentration. Therefore, these ranges offer opportunity for further characterization. The electrode reaction of 4-methoxyphenol was found to be a diffusion-controlled process in the solvents applied (water, acetonitrile, dimethyl sulfoxide, dimethyl formamide, nitrobenzene, acetone, dichloromethane, methanol, ethanol, 1-propanol, 1-butanol, and 1-pentanol). Diffusion coefficients of 4-methoxyphenol were determined with a microelectrode using the steady-state voltammograms. Diffusion coefficients of other phenols were measured only in acetonitrile with a macroelectrode. In agreement with known theories, the diffusion coefficients showed inversely proportional relationships with the solvent viscosities. Special care was needed in 1-pentanol solvent since the increasing anodic peaks appeared after the first scan and overlaid with the sigmoidal-shaped regular microelectrode voltammograms. This observation is probably due to formation of adhering residual electroactive products.
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来源期刊
Canadian Journal of Chemistry
Canadian Journal of Chemistry 化学-化学综合
CiteScore
1.90
自引率
9.10%
发文量
99
审稿时长
1 months
期刊介绍: Published since 1929, the Canadian Journal of Chemistry reports current research findings in all branches of chemistry. It includes the traditional areas of analytical, inorganic, organic, and physical-theoretical chemistry and newer interdisciplinary areas such as materials science, spectroscopy, chemical physics, and biological, medicinal and environmental chemistry. Articles describing original research are welcomed.
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