Binary mixtures of 1,3-dialkylimidazolium based ionic liquids （ILs） and water were selected as solvent systems to investigate the solute-solvent and solvent-solvent interactions on the preferential solvation of solvatochromic indicators at 25 ℃. Empirical solvatochromic pa- rameters, dipolarity/polarizability （π^＊）, hydrogen-bond donor acidity （α）, hydrogen-bond acceptor basicity （β）, and Reichardt＇s polarity parameters （ET^N） were measured from the ultraviolet-visible spectral shifts of 4-nitroaniline, 4-nitroanisole, and Reichardt＇s dye. The solvent properties of the IL-water mixtures were found to be influenced by IL type and IL mole fraction （XIL）. All these studied systems showed the non-ideal behavior. The max- imum deviation to ideality for the solvatochromic parameters can be obtained in the XIL range from 0.i to 0.3. For most of the binary mixtures, the π^＊ values showed the synergistic effects instead of the ETN, α and β values. The observed synergy extent was dependent on the studied systems, such as the dye indicator and IL type. A preferential solvation model was utilized to gather information on the molecular interactions in the mixtures. The dye indicator was preferentially solvated on the following trend： IL〉IL-water complex〉water.
The simplest zeolite,sodalite(SOD),was synthesized iononic liquid-thermally from aqueous basic aluminosilicate precursor gels in an imidazolium-based ionic liquid,with 1-ethyl-3-methylimidazolium bromide as solvent.The synthesis was carried out at a temperature between 50 and 150 ℃ at an ambient pressure.The effects of mass ratios of aqueous gel to ionic liquid,molar ratios of n(Si)/n(Al) in gel and crystallization temperature and time on the crystallization were investigated.The morphology and structure of the as-prepared products were characterized by X-ray diffraction and scanning electron microscopy.The results show that a mixture of sodalite and zeolite X was initially precipitated in ionic liquid at a ratio 1∶3 of aqueous gel to ionic liquid,and finally transformed in to pure sodalite as the crystallisation time is prolonged,and the crystallinity of sodalite increased with the increase of n(Si)/n(Al) from 1.1 to 10.Increasing the ratio of aqueous gel to ionic liquid,zeolite X was favorable to crystallize,and it became the only product under the hydrothermal condition.
