Synthesis And Properties Of Surfactants Used As Ionic Liquids

Imidazoliurn surfactant has properties of both surfactant and ionic liquid. The host-guest chemistry is one main direction of chemical research. The study of hostguest chemistry between cucurbit and imidazoliurn surfactant will help us to design supramolecular compoundsGemini surfactant consists of two hydrophilic groups and two hydrophobic chains,which are connected with a spacer group. Bola surfactant is a compound which has two hydrophilic polar groups connected with a hydrophobic chain. Gemini surfactant and Bola surfactant are new types of surfactants.We synthesized two kinds of surfactants which can be used as ionic liquid. The main raw materials included imidazole, 1,2-dibromoethane, 1,6-Dibromohexane, 4,4-bipyridine, etc.The surface properties of the Gemini surfactants in the aqueous solution were studied. The physic-chemical parameters such as the critical micelle concentration(cmc), the surface tension(γcmc) and the saturation adsorption capacity(Γmax) were measured. When the number of carbon atoms of the link group increased, the critical micelle concentration(cmc) and the surface tension(γcmc) increased. When the number of carbon atoms of hydrophobic chain increased, the value of cmc decreased.The host-guest complexes about cucurbit and surfactant were investigated used1 H NMR, isothermal titration calorimetry(ITC) and surface tension. The ratio of ILGIS and Q[6] is 1:1. The location is at the link group. The ratio of ILGBS and Q[8] is 1:2and the location is at the hydrophobic chain. The ratio of ILBIS and Q[6] is 1:1 and the location is at the hydrophobic chain. The ratio of ILBBS and Q[7] is 1:2 and the location is at the hydrophilic group. The values of cmc and γcmc increased due to the effect of cucurbit.