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合成了一种棒形的化合物4,4’-二(α-腈基-4-苯丙氧基苯乙烯)联苯(Ben-DCSB),利用核磁共振(NMR)、质谱(EI-MS)、傅里叶变换红外光谱(FT-IR)和元素分析等对其进行了结构表征.对Ben-DCSB重结晶粉末进行研磨后,其发光颜色从蓝绿色变成黄绿色,荧光量子效率(ΦF)从初始的52.7%变为38.7%,表明该化合物具有力致变色性质.扫描电子显微镜(SEM)、X-射线衍射(XRD)和荧光寿命等测试结果显示,这种现象是由于在外界环境刺激下改变了Ben-DCSB在聚集态下的分子堆积结构所造成的.研磨后的样品暴露在溶剂蒸气(乙醇、二氯甲烷、四氢呋喃或丙酮)或100℃温度下放置2 min又能转换回初始状态的蓝绿色荧光,表明化合物研磨后的样品具有气致和热致变色性能,且展现出可逆变色性能.对该化合物进行多次“力-溶剂蒸气刺激”和“力-热刺激”循环实验,结果显示其具有很好的荧光可逆转换性能.热分析结果显示化合物Ben-DCSB在194℃和212℃间存在向列相(纹影织构)的液晶态;其热分解温度为362℃,表明该化合物具有较好的热稳定性.
A rod-shaped compound, 4,4’-bis (α-nitrile-4-phenylpropoxystyrene) biphenyl was synthesized and characterized by means of nuclear magnetic resonance (NMR), mass spectrometry (EI-MS) , Fourier transform infrared spectroscopy (FT-IR) and elemental analysis etc. After the Grind of Ben-DCSB recrystallized powder, the luminescence color changes from blue-green to yellow-green, and the fluorescence quantum efficiency ) From the initial 52.7% to 38.7%, indicating that the compound has the properties of the chromochromic properties of the compound.Finally, the results of the scanning electron microscopy (SEM), X-ray diffraction (XRD) and fluorescence lifetime show that this phenomenon is due to the external environment Stimulated by the molecular structure of Ben-DCSB in the aggregated state, which resulted in the ground sample being exposed to solvent vapors (ethanol, methylene chloride, tetrahydrofuran or acetone) or placed at 100 ° C for 2 min and back again The initial state of the blue-green fluorescence, indicating that the compound after grinding the sample has gas-induced and thermochromic properties, and exhibits reversible color change performance of the compound several times “force - solvent vapor stimulation” and “force - thermal stimulation ”cycle experiment, the results show that it has good fluorescence reversible conversion performance. Thermal Analysis The results show that Ben-DCSB has a nematic (smectic texture) liquid crystal state between 194 ℃ and 212 ℃. The thermal decomposition temperature of Ben-DCSB is 362 ℃, indicating that the compound has good thermal stability.