Dicationic ionic liquid crystals: Synthesis, characterization, optical properties, and ionic conductivity of bis(4-oligoethyleneoxyphenyl) viologen bistosylate salts
作者:Pradip K. Bhowmik、Si L. Chen、David King、Haesook Han、Zane Bolyard、Christopher Schmiedl、Michael R. Fisch、Sanjeev R. Gopal、Thamil Selvi Velayutham、Alfonso Martinez-Felipe
DOI:10.1016/j.molliq.2024.124140
日期:2024.3
and variable temperature X-ray diffraction (VTXRD) techniques. The salts exhibited weak fluorescent emission in dichloromethane and no emission in acetonitrile but exhibited light emission in the solid state. Their absolute quantum yields ranged between 3 and 12 %. Impedance spectroscopy showed that the ionic conductivity of the salts increases with the number of oxyethylene units in the extended viologen
通过Zincke反应,再与甲苯磺酸银进行复分解反应,制备了三种不同长度的双(4-低聚乙烯氧基苯基)紫精双甲苯磺酸盐,并通过核磁共振(NMR)、傅里叶变换红外(FTIR)技术证实了其化学结构。和元素分析。热重分析 (TGA) 显示这些盐具有出色的热稳定性,在 283 至 288 °C 之间仅损失初始质量的 5%。通过差示扫描量热法 (DSC)、偏光光学显微镜 (POM) 和变温 X 射线衍射 (VTXRD) 技术测定液晶相和转变温度。该盐在二氯甲烷中表现出弱荧光发射,在乙腈中没有发射,但在固态下表现出发光。它们的绝对量子产率在 3% 到 12% 之间。阻抗谱表明,盐的离子电导率随着延伸紫精部分中氧乙烯单元的数量而增加。两端含有四个氧乙烯单元的盐的电导率达到10 S·cm,这归因于其较大的分子柔性和改进的离子液体迁移率。