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Effect of anionic micelles of sodium dodecyl sulfate on protonation equilibria of salicylic acid derivatives

机译：十二烷基硫酸钠阴离子胶束对水杨酸衍生物质子平衡的影响

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The impact of sodium dodecyl sulfate (SDS) on the protonation equilibria of 5-sulfosalicylic acid and 5-Hydroxysalicylic acid has been studied in various concentrations (0.0?2.5%?w/v) of sodium dodecyl sulfate solution maintaining an ionic strength of 0.16?mol?dm~(?3) Nacl at 303?K. The protonation constants have been calculated with the computer program MINIQUAD75 and the best fit models are arrived at based on statistical grounds employing crystallographic R factor, χ ~(2), skewness, and kurtosis. These protonation constants values have been found to shift in micellar media as compared to those in pure water. The differences in the values have been attributed to the solvent properties of the interfacial and bulk phases involving contribution from the micellar surface potential in the case of charged micelles. The trend of log values of stepwise protonation constants with mole fraction of the medium have been explained based on electrostatic and non-electrostatic forces operating on the protonation equilibria. Distributions of species, protonation equilibria, and effect of influential parameters on the protonation constants have also been presented.
机译：在十二烷基硫酸钠溶液中，各种浓度（0.0？2.5％？w / v）保持离子强度为0.16的十二烷基硫酸钠（SDS）对5-磺基水杨酸和5-羟基水杨酸的质子平衡的影响已得到研究。 303mol·K时的mol·dm·（〜3）Nacl。已经使用计算机程序MINIQUAD75计算了质子化常数，并基于采用结晶学R因子，χ〜（2），偏度和峰度的统计依据得出了最佳拟合模型。已经发现，与在纯水中的质子化常数值相比，在胶束介质中的质子化常数值发生了变化。值的差异归因于界面相和本体相的溶剂性质，在带电胶束的情况下，涉及胶束表面电势的贡献。基于作用在质子平衡上的静电力和非静电力，已经解释了质子逐步质子常数的对数值的趋势。还介绍了物种分布，质子化平衡以及影响参数对质子化常数的影响。

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