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首页> 外文期刊>Journal of Solution Chemistry >Modeling of Protonation Constants of Linear Aliphatic Dicarboxylates Containing -S-Groups in Aqueous Chloride Salt Solutions, at Different Ionic Strengths, Using the SIT and Pitzer Equations and Empirical Relationships
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Modeling of Protonation Constants of Linear Aliphatic Dicarboxylates Containing -S-Groups in Aqueous Chloride Salt Solutions, at Different Ionic Strengths, Using the SIT and Pitzer Equations and Empirical Relationships

机译:使用SIT和Pitzer方程及经验关系对不同离子强度下的含氯盐水溶液中含-S-基的直链脂肪族二羧酸酯的质子化常数进行建模

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摘要

The protonation constants of ethylenedithiodiacetic, dithiodipropionic and dithiodibutyric acids were obtained from potentiometric measurements in NaCl(aq) (I≤5 mol⋅L−1) and (CH3)4NCl(aq) (I≤3 mol⋅L−1) at t=25 °C. Their dependences on ionic strength were modeled by the SIT and Pitzer approaches. The activity coefficients of the neutral species were obtained by solubility measurements. The literature values of the protonation constants of (HOOC)-(CH2) n -S-(CH2) n -(COOH) (n=1 to 3) and (HOOC)-(CH2)-S-(CH2) n -S-(CH2)-(COOH) (n=0 to 5) in NaCl(aq) and KCl(aq) (I≤3 mol⋅L−1) at 18 °C were also analyzed using the above approaches. Both the log 10 K i H and interaction parameter values follow simple linear trends as a function of certain structural characteristics of the ligands. Examples of modeling these trends are reported.
机译:通过在NaCl(aq)(I≤5mol⋅L -1 )和(CH 3 )<下的电位测量获得亚乙基二硫代二乙酸,二硫代二丙酸和二硫代二丁酸的质子化常数sub> 4 NCl(aq)(I≤3mol⋅L -1 )在t = 25°C时。它们对离子强度的依赖性通过SIT和Pitzer方法建模。中性物质的活度系数通过溶解度测量获得。 (HOOC)-(CH 2 n -S-(CH 2 n的质子常数的文献值/ sub>-(COOH)(n = 1至3)和(HOOC)-(CH 2 )-S-(CH 2 n -S-(CH 2 )-(COOH)(n = 0至5)(I≤3mol⋅L -1 <还使用上述方法分析了在18°C下的温度。 log 10 K i H 和相互作用参数值都遵循简单的线性趋势,这是配体某些结构特征的函数。报告了对这些趋势进行建模的示例。

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