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以1-甲基咪唑,四氟硼酸铵,六氟磷酸钾,溴代十四烷及溴代十六烷为主要原料,合成了6个长链烷基咪唑盐类离子型化合物。以元素分析、IR及1 H-NMR对化合物结构进行了表征。通过DSC和偏光显微镜研究了化合物的液晶相。结果表明,6个离子型有机化合物均具有热致液晶性,呈现液晶相扇形织构。在加热过程中,其液晶区间为34～144℃,冷却过程中为47～151℃。对于阴离子相同的离子液晶化合物,烷基链较长时液晶区间更宽。进一步研究发现,这些离子液晶相互混合后其熔点降低,且仍可以体现出热致液晶性及扇形织构;当阴离子为溴离子型的化合物相互混合后,混合物的液晶区间比组成它的纯净物更宽。
Six long-chain alkyl imidazolium ionic compounds were synthesized with 1-methylimidazole, ammonium tetrafluoroborate, potassium hexafluorophosphate, bromodecane tetrabromide and hexadecyl bromide as the main raw materials. The structure of the compound was characterized by elemental analysis, IR and 1 H-NMR. The liquid crystal phase of the compound was investigated by DSC and polarized light microscopy. The results show that the six ionic organic compounds all have thermotropic liquid crystallinity and show the liquid crystal phase fan-shaped texture. In the heating process, the liquid crystal range of 34 ~ 144 ℃, the cooling process is 47 ~ 151 ℃. For the same anionic ionic liquid crystal compound, the longer the alkyl chain, the wider the liquid crystal range. Further study found that the ionic liquid crystal after mixing with each other to reduce its melting point, and can still reflect the thermotropic liquid crystal and fan-shaped texture; when the anion is bromine-type compound mixed with each other, the mixture of the liquid crystal interval than the composition of its pure Wider.