Synergistic enhancing of micellization and thermodynamic properties of some Gemini cationic surfactants related to benzo[d]thiazol-3-ium bromide

IF 4.3 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Farid I. El-Dossoki, Mohamed A. Migahed, Mahmoud M. Gouda, Samir A. Abd El-Maksoud
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引用次数: 0

Abstract

Herrin, three Gemini cationic surfactants related to benzo[d]thiazol-3-ium bromide with variable hydrocarbon chain lengths (TBC n = 6, 12, and 18) were synthesized successfully and confirmed by using IR and 1HNMR spectroscopies. Critical micelle concentration and different thermodynamic properties of all surfactants under study were measured using conductivity, density, molal volume, and refractive index techniques. The Critical micelle concentration of TBC 6, TBC 12, and TBC 18 surfactants measured from the different techniques shows an acceptable agreement. The molecular weight of the investigated surfactants was decreased with the order: TBC 18 > TBC 12 > TBC 6. An increase in the magnitudes of the association constant, Gibbs free energy of micellization, molar refraction, polarizability, and binding constant proved the effect of hydrocarbon chain length on increasing surfactant’s micellization as follows: TBC 18 < TBC 12 < TBC 6. The enhancement in surfactant properties was also indicated under the effect of different concentrations of inorganic salts (NaI, NaBr, NaCl, MnCl2, CuCl2, and CoCl2). This effect was measured using conductivity and refractive index measurements. Different salts were indicated to adsorb on head groups of micelles, leading to an increase in the degree of ionization of the surfactant solution and improved aggregation of the surfactant at lower concentrations. The increase in the negative value of Gibbs free energy of association in the presence of salts proved an increase in the stability of micelles formed in a 15% DMSO-water solvent at 298.15 K.

与苯并[d]噻唑-3-溴化ium相关的Gemini阳离子表面活性剂的胶束化和热力学性能的协同增强
成功合成了三种与变烃链长的苯并[d]噻唑-3-溴化ium (TBC n = 6、12和18)相关的Gemini阳离子表面活性剂Herrin,并通过IR和1HNMR光谱对其进行了证实。利用电导率、密度、摩尔体积和折射率等技术测量了所有表面活性剂的临界胶束浓度和不同的热力学性质。TBC 6、TBC 12和TBC 18表面活性剂的临界胶束浓度用不同的方法测定,结果一致。所研究的表面活性剂的分子量依次为:TBC 18 >; TBC 12 > TBC 6。结合常数、吉布斯胶束自由能、摩尔折射、极化率和结合常数的增加证明了烃链长度对表面活性剂胶束化的影响如下:TBC 18 <; TBC 12 < TBC 6。在不同浓度的无机盐(NaI、NaBr、NaCl、MnCl2、CuCl2和CoCl2)的作用下,表面活性剂的性能也有所增强。这种效应是通过电导率和折射率测量来测量的。不同的盐会吸附在胶束的头基团上,导致表面活性剂溶液的电离程度增加,并在较低浓度下改善表面活性剂的聚集。在盐的存在下,吉布斯自由缔合能的负值增加,证明了在15% dmso -水溶剂中形成的胶束在298.15 K时的稳定性增加。
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来源期刊
BMC Chemistry
BMC Chemistry Chemistry-General Chemistry
CiteScore
5.30
自引率
2.20%
发文量
92
审稿时长
27 weeks
期刊介绍: BMC Chemistry, formerly known as Chemistry Central Journal, is now part of the BMC series journals family. Chemistry Central Journal has served the chemistry community as a trusted open access resource for more than 10 years – and we are delighted to announce the next step on its journey. In January 2019 the journal has been renamed BMC Chemistry and now strengthens the BMC series footprint in the physical sciences by publishing quality articles and by pushing the boundaries of open chemistry.
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