在本文中,我们介绍了三种不同的六苯并二苯并(HBC)的热致液晶衍生物的合成和表征,它们在外围被六个手性或外消旋的分支(3,7-二甲基辛基)链取代,即手性5a,外消旋5b和具有五个烷基链的单溴官能化18。还描述了主要依靠过渡金属催化的偶联反应合成HBC前体的改进方法。相对于载有n的类似HBC,当K→D H的热转变转变为更低的温度时,溶解度和可加工性得到了提高-烷基链。在被手性支链烷基链5a取代的情况下,已经通过圆二色光谱法记录了强信号。所有新化合物均通过1 H,13 C NMR,UV-Vis光谱和FD-MS表征。初步的中间相表征是通过差示扫描量热法(DSC)和偏振光显微镜进行的。在DSC实验过程中,对光学纯和外消旋HBC衍生物进行了比较。
作者:Shine K. Albert、Irla Sivakumar、Murali Golla、Hari Veera Prasad Thelu、Nithiyanandan Krishnan、Joseph Libin K. L.、Ashish、Reji Varghese
DOI:10.1021/jacs.7b09283
日期:2017.12.13
Design and synthesis of high aspect ratio 2D nanosheets with surface having ultradense array of information-rich molecule such as DNA is extremely challenging. Herein, we report a universal strategy based on amphiphilicity-driven self-assembly for the crafting of high aspect ratio, 2D sheets that are densely surface-decorated with DNA. Microscopy and X-ray analyses have shown that the sheets are crystalline
设计和合成表面具有超密集信息丰富分子(如 DNA)阵列的高纵横比 2D 纳米片极具挑战性。在此,我们报告了一种基于两亲性驱动的自组装的通用策略,用于制作高纵横比、表面有 DNA 密集装饰的 2D 片材。显微镜和 X 射线分析表明,这些薄片是结晶的。薄片最独特的特征是 DNA 导向的表面可寻址性,这可以通过序列特异性 DNA 杂交用金纳米粒子装饰薄片的任一面来证明。我们的结果表明,这种设计策略可以作为合成 DNA 装饰高纵横比片的通用方法,这可能会在材料科学、药物输送、
Discotic liquid crystalline hexabenzocoronenes carrying chiral and racemic branched alkyl chains: supramolecular engineering and improved synthetic methods
In this paper we present the synthesis and characterization of three different thermotropic liquidcrystalline derivatives of hexabenzocoronene (HBC), substituted at the periphery by six chiral or racemic branched (3,7-dimethyloctanyl) chains, namely the chiral 5a, racemic 5b, and mono-bromo functionalized 18 carrying five alkyl chains. Improved methods for synthesis of HBC precursors, largely relying
在本文中,我们介绍了三种不同的六苯并二苯并(HBC)的热致液晶衍生物的合成和表征,它们在外围被六个手性或外消旋的分支(3,7-二甲基辛基)链取代,即手性5a,外消旋5b和具有五个烷基链的单溴官能化18。还描述了主要依靠过渡金属催化的偶联反应合成HBC前体的改进方法。相对于载有n的类似HBC,当K→D H的热转变转变为更低的温度时,溶解度和可加工性得到了提高-烷基链。在被手性支链烷基链5a取代的情况下,已经通过圆二色光谱法记录了强信号。所有新化合物均通过1 H,13 C NMR,UV-Vis光谱和FD-MS表征。初步的中间相表征是通过差示扫描量热法(DSC)和偏振光显微镜进行的。在DSC实验过程中,对光学纯和外消旋HBC衍生物进行了比较。
Discotic hexa-peri-hexabenzocoronenes with strong dipole: synthesis, self-assembly and dynamic studies
Strong dipole moments have been built into two hexa-peri-hexabenzocoronene (HBC) derivatives (1 and 2) originating from the push–pull structure of the molecules with one electron-donating and one electron-withdrawing substituent. The influence of dipole moment on the self-assembly of HBCs in solution and in bulk has been investigated.