Hydrogen-bonded liquid crystal complexes: A comprehensive study of structure, behaviour and potential applications
作者:Bassem Meddeb、Manel Ben Salah、Salim Zghal、Naoufel Ben Hamadi、Ahlem Guesmi、Youssef Arfaoui、Souhaila Hbaieb、Taoufik Soltani
DOI:10.1016/j.molliq.2023.123838
日期:2024.2
derivatives (nOBAF) and 1,4-diazabicyclo [2.2.2] octane (DABCO) has been prepared and characterized by Fourier-transform infrared spectroscopy. The thermal behavior was determined by differential scanning calorimetry and observed by polarized optical microscopy. All complexes were found to exhibit smectic G (SmG) and smectic B (SmB) phases over a wide temperature range. Furthermore, it was found that the
分子间氢键(HB)相互作用成为超分子化学和软物质科学中深入研究的课题。在此,制备了一系列由3-氟苯甲酸衍生物(nOBAF)和1,4-二氮杂双环[2.2.2]辛烷(DABCO)组成的新系列氢键液晶(HBLC),并通过傅里叶变换红外光谱对其进行了表征。通过差示扫描量热法测定热行为并通过偏光光学显微镜观察。所有配合物均在较宽的温度范围内表现出近晶 G (SmG) 和近晶 B (SmB) 相。此外,发现这些中间相的热稳定性随着烷氧基链长度的增加而增加。复介电常数报告为 1 Hz–10 MHz 范围内频率的函数。在 SmB 中观察到归因于方位角集体波动的较低频率过程和与软模式相关的较高频率。在 SmG 中,除了软模式 (10 Hz) 之外,还首次检测到更高频率的模式 (10 Hz)。这些配合物获得的实验结果与密度泛函理论(DFT)计算相关。此外,这些结果表明 nOBAF/DABCO 有潜力成为可切换介电材料。