【摘要】 以N-三甲基硅基咪唑、1-溴十二烷为主要原料合成了一个具有双长链的咪唑离子液体——溴化1,3-双十二烷基咪唑(C₁₂MC₁₂)。C₁₂MC₁₂与多金属氧酸盐(H₄SiW₁₂O₄₀)通过离子交换反应制备了1,3-双十二烷基咪唑硅钨酸盐(C₁₂MC₁₂-SiW₁₂)。并通过¹H-NMR、傅里叶变换红外（FT-IR）、热重（TGA）、差示扫描量热仪（DSC）、偏光显微镜（POM）和变温X射线衍射（XRD）对C₁₂MC₁₂和C₁₂MC₁₂-SiW₁₂的性质进行表征。结果表明C₁₂MC₁₂具有液晶性质,为层状介晶结构。当用多酸阴离子SiW₁₂O₄₀^4-取代C₁₂MC₁₂中的Br^-后,C₁₂MC₁₂-SiW₁₂的熔点升高,液晶性质消失,但仍为准层状结构。更多还原

【Abstract】 An indazolium ionic liquid with double long chains,1,3-didodecyl imidazolium bromide(C₁₂MC₁₂),was synthesized by taking N-trimethylsilyl imidazole and 1-bromodecane as main materials.Then,1,3-didodecyl imidazole silicotungstate(C₁₂MC₁₂-SiW₁₂)was prepared by straightforward ion exchange reaction of C₁₂MC₁₂ and polyoxometalates(H₄SiW₁₂O₄₀).The properties of C₁₂MC₁₂ and C₁₂MC₁₂-SiW₁₂ were characterized by ¹H-NMR,infrared（FT-IR）,thermogravimetry（TGA）,differential scanning calorimeter（DSC）,polarizing microscopy（POM）and temperature-dependent X-ray diffraction（XRD）.The results showed that C₁₂MC₁₂ had liquid crystal properities and was layed mesomorphic structure.When SiW₁₂O₄₀^4-substituteed for Br^-in C₁₂MC₁₂,the melting point of C₁₂MC₁₂-SiW₁₂ increased and the mesogenic properties disappeared,but C₁₂MC₁₂-SiW₁₂ still retained quasi-lamellar structure.更多还原