Desymmetrization of 3,3′-Bis(acylamino)-2,2′-bipyridine-Based Discotics: The High Fidelity of Their Self-Assembly Behavior in the Liquid-Crystalline State and in Solution
作者:Michel H. C. J. van Houtem、Rafael Martín-Rapún、Jef A. J. M. Vekemans、E. W. Meijer
DOI:10.1002/chem.200902416
日期:2010.2.15
studied with 1H NMR spectroscopy, whereas the self‐assembled state in apolar solution was examined with optical spectroscopy. Remarkably, these desymmetrized discotics, which lack one aliphatic wedge, behave similar to the symmetric parent compound. To prove that the stacking behavior of discotics 1 and 2 is similar to that of reported C3‐symmetrical derivatives, a mixing experiment of chiral 1 with C3‐symmetrical
通过统计方法合成了基于3,3'-双(酰基氨基)-2,2'-联吡啶单元的两个新颖的非对称盘状分子1和2。Discotic 1具有6个手性二氢香茅醚尾巴和1个外围苯基,而Discotic 2具有6个线性十二烷基氧基尾巴和1个吡啶基外围。通过强分子内氢键的预组织和随后的芳族相互作用诱导了盘状核素的自组装。1和2的液晶度是通过偏振光学显微镜,差示扫描量热法和X射线衍射确定的。两个柱状矩形中间相(Col r),但对于C 3对称衍生物,只发现了一个Col r中间相。1在溶液中,通过1 H NMR光谱研究了氯仿中的分子溶解状态,而在非极性溶液中的自组装状态通过光谱学进行了研究。值得注意的是,这些缺乏对称性的圆盘型碟片缺少一个脂族楔形物,其行为与对称的母体化合物相似。为了证明圆盘粒子1和2的堆积行为与已报道的C 3对称衍生物的堆积行为相似,是手性1与C 3的混合实验对称的13已被采用;它表明它们确实属于一种自组装类型。UV