芳烃-氟代芳烃和氢键作用调控的树枝状分子自组装及其液晶性质

发布时间：2018-07-29 12:40

【摘要】：通过收敛法合成了母核为亚胺键连接的芳环与氟代芳环,外围为3,4,5-三(正十二烷氧基)苯基亚甲基的第一代树枝状亚胺分子,并对其热致液晶行为和聚集体结构进行了研究.示差扫描量热和热台偏光光学显微镜研究表明该亚胺分子在93?C到118?C的温度范围内为具有双折射的液晶相.X-射线衍射结果表明该亚胺分子的液晶相为斜柱状结构(a=4.90 nm,b=3.51 nm,γ=110?).芳环-氟代芳环的面对面交替堆积和氢键驱动亚胺分子形成了柱状聚集体,分子外围的柔性十二烷氧基链的无序伸展,与母核聚集体发生微相分离,促使了亚胺分子斜柱状液晶相的形成.
[Abstract]:The first generation dendritic imine molecules with an imine bond of the mother nucleus and a fluoroaromatic ring with a periphery of 3 ~ 4N ~ 5- tris (n-dodecyloxy) phenyl methylene were synthesized by convergence method. The thermotropic liquid crystal behavior and the aggregate structure of the dendrimers were also studied. The results of differential scanning calorimetry and polarizing optical microscopy show that the imine molecule is a birefringent liquid crystal phase with birefringence in the temperature range from 93C to 118C. The results show that the liquid crystal phase of the imine molecule is an oblique columnar structure (a4.90 nmBN 3.51 nm, 纬 110?). The face to face stacking of aromatic ring and fluoroaromatic ring and the hydrogen bond drive the imine molecules to form columnar aggregates. The flexible dodecoxyl chains around the molecules spread out disorderly and separated from the parent nuclear aggregates. The formation of the liquid crystal phase of imine molecule is inclined columnar.
【作者单位】：北京大学化学与分子工程学院;
【基金】：国家自然科学基金(基金号21074004)资助项目
【分类号】：O641.3;O753.2

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