Lugger Jody A M, Sijbesma Rint P
Laboratory of Macromolecular and Organic Chemistry and the Institute for Complex Molecular Systems Eindhoven University of Technology P. O. Box 513 5600 MB Eindhoven The Netherlands.
ChemistryOpen. 2016 Oct 24;5(6):580-585. doi: 10.1002/open.201600078. eCollection 2016 Dec.
We report the formation of easily accessible hydrogen-bonded columnar discotic liquid crystals (LCs) based on tris-benzoimidazolyl benzene () and commercially available fatty acids. By increasing the length of the fatty acid, the temperature range of liquid crystallinity was tuned. Introducing double bonds in octadecanoic acid lowered the crystallization temperature and increased the temperature range of the mesophase. Surprisingly, dimerized linoleic acid also forms an LC phase. When using branched aliphatic acids with the branching point close to the acid moiety, the mesophase was lost, whereas phosphonic acid or benzenesulfonic acid derivatives did have a mesophase, showing that the generality of this approach extends beyond carboxylic acids as the hydrogen-bond donor. Furthermore, a polymerizable LC phase was obtained from mixtures of with a methacrylate-bearing fatty acid, providing an approach for the fabrication of nanoporous polymer films if the methacrylate groups are polymerized. Finally, the higher solubility of methyl- was used to suppress phase separation in stoichiometric mixtures of the template molecule with fatty acids.
我们报道了基于三苯并咪唑基苯（）和市售脂肪酸形成易于制备的氢键柱状盘状液晶（LCs）。通过增加脂肪酸的长度，调节了液晶态的温度范围。在十八烷酸中引入双键降低了结晶温度并增加了中间相的温度范围。令人惊讶的是，二聚亚油酸也形成了液晶相。当使用支链点靠近酸部分的支链脂肪酸时，中间相消失，而膦酸或苯磺酸衍生物确实有中间相，表明这种方法的通用性超出了作为氢键供体的羧酸。此外，通过与带有甲基丙烯酸酯的脂肪酸的混合物获得了可聚合的液晶相，如果甲基丙烯酸酯基团聚合，这为制备纳米多孔聚合物膜提供了一种方法。最后，甲基 - 的较高溶解度用于抑制模板分子与脂肪酸的化学计量混合物中的相分离。
