Synthesis and Surface Properties of Novel Gemini Imidazolium Surfactants was written by Wang, Liyan;Liu, Jia;Huo, Shichao;Deng, Qigang;Yan, Tie;Ding, Limin;Zhang, Chao;Meng, Lingwei;Lu, Qiangna. And the article was included in Journal of Surfactants and Detergents in 2014.Electric Literature of C11H20N2 This article mentions the following:
Five new Gemini imidazolium surfactants were synthesized from imidazole and 1-bromoalkane (C8, C10, C12, C14, C16) to get 1-alkylimidazole, which was further reacted with 1,3-dichloropropan-2-ol to form the surfactant mol., 1,1′-(propane-1,3-diyl-2-ol) bis(3-alkyl-1H-imidazol-3-ium) chloride. The structures of the five new surfactants and intermediates were characterized by 1H-NMR, 13C-NMR and IR spectra. Thermal properties of the five new surfactants were studied with thermogravimetric anal. and differential scanning calorimetry, the five new surfactants showed a transition from a crystalline phase to a thermotropic liquid-crystalline phase at around ca. 100 °C, which transformed to an isotropic liquid phase at around ca. 165 °C. The five new surfactants critical micelle concentrations (CMC) in the aqueous solutions were determined by surface tension and elec. conductivity methods. The surface tension measurements provided a series of parameters, including critical micelle concentration (CMC), surface tension at the CMC (γCMC), adsorption efficiency (pC20), and effectiveness of surface tension reduction (πCMC). In addition, with application of the Gibbs adsorption isotherm, maximum surface excess concentration (Γmax) and min. surface area/mol. (Amin) at the air-water interface were obtained. The parameters β (degree of counterion binding to micelles), ΔGθads (Gibbs free energy of adsorption), and ΔGθmic (Gibbs free energy change of micellization) were also derived. The results indicated that the five new Gemini surfactants exhibited very low CMC and a good efficiency in lowering the surface tension of water. The foamability and foam stability of the five new surfactants were also examined at different CMC. In the experiment, the researchers used many compounds, for example, 1-Octyl-1H-imidazole (cas: 21252-69-7Electric Literature of C11H20N2).
1-Octyl-1H-imidazole (cas: 21252-69-7) belongs to imidazole derivatives. Many natural products, especially alkaloids, contain the imidazole ring. These imidazoles share the 1,3-C3N2 ring but feature varied substituents. Imidazole derivatives have antibacterial, antifungal and anticancer functionality. It interacts with DNA and also binds to protein and stops cell division.Electric Literature of C11H20N2
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem