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以端基为C3及C5取代的多环酸为原料,合成了6个具有双酯基中介核,末端为TEMPO(TEMPO=2,2,6,6-tetramethylpiperidine-1-oxyl)的磁性分子.用元素分析,红外光谱,质谱等对其结构进行了表征;利用超导量子干涉仪(SQUID磁学测量系统),顺磁共振仪,差热扫描量热仪以及热台偏光显微镜等对化合物的磁性质和液晶性质进行了测定,提出了该类化合物同时具有磁性及液晶性所应具备的分子结构;最后,将磁性液晶与液晶材料进行了混配,测试了混配液晶的光电性能.结果表明,6个化合物均同时具有磁性和液晶性,其液晶相温度区间在16～24.8℃,呈典型的向列相织构;磁性液晶与液晶材料混配后可明显改善液晶材料的响应灵敏度.
Using polycyclic acids with terminal groups of C3 and C5 substituted as starting materials, six magnetic molecules with diester intermediates and TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidine-1-oxyl) were synthesized. Their structures were characterized by elemental analysis, infrared spectroscopy and mass spectrometry. Their structures were characterized by means of superconducting quantum interference (SQUID), paramagnetic resonance spectroscopy, differential scanning calorimetry and hot stage polarization microscope Magnetic properties and liquid crystal properties were determined, and the molecular structure of the compounds with both magnetic and liquid crystallinity was proposed. Finally, the magnetic liquid crystal and the liquid crystal material were mixed to test the photoelectric properties of the mixed liquid crystal .Results The results show that the six compounds have both magnetic and liquid crystallinity, and the liquid crystal phase temperature ranges from 16 ℃ to 24.8 ℃, showing a typical nematic phase texture. When mixed with magnetic liquid crystal and liquid crystal material, the response sensitivity of the liquid crystal material can be obviously improved.