Nowadays, intensive research has focused on the design and synthesis of function-integrated smart materials resulting from the spontaneous self-assembly of appropriately chosen functional molecules. 朝着这个方向努力,我们合成了一系列新的非常规手性柱状液晶 (Col LC),其中环三磷腈核心被基于胆固醇的席夫碱二聚单元包围。胆固醇,通过以下方式共价结合到双环席夫碱核上一个不同长度和奇偶校验的柔性垫片,已被有预谋地结合起来,以在 Col 流体宏观结构中诱导手性。这些研究使用多种互补技术,清楚地揭示了间隔物的长度而不是奇偶性对由合成化合物的固有 Col 组装产生的 2D 晶格对称性的影响。通过详细的电子密度映射和小角/广角
Synthesis and characterization of novel cholesterol based mesogenic compounds using ‘click’ chemistry
作者:K. C. Majumdar、Shovan Mondal、Randhir K. Sinha
DOI:10.1039/b9nj00744j
日期:——
An efficient route for the synthesis of hitherto unreported non-symmetric dimesogens consisting of a cholesteryl moiety and an aromatic mesogenic unit interconnected through a pentamethylene or decamethylene spacer by Cu(I)-catalyzed azideâalkyne cycloaddition âclickâ chemistry has been developed. The aromatic units consist of two phenyl rings linked to a triazole moiety. A new trimesogen consisting two cholesteryl esters and an aromatic segment joined by pentamethylene spacer has also been synthesized. The newly synthesized mesogens show N*, TGB and partially bilayered SmC* (SmCd*) phases. The liquid crystalline phases were investigated with the help of polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and powder X-ray diffraction studies. DFT study was also used to locate the orientation of the dipole at the centre position i.e. at ester linkage. All the compounds were characterized from their elemental analyses and spectral data.
Synthesis and Characterization of Cholesterol-Based Tetramers
作者:K. C. Majumdar、S. Ponra、S. Chakravorty
DOI:10.1080/15421406.2010.504628
日期:2010.10.14
Novel symmetrical liquid-crystal tetramers were designed and synthesized. The length of the central spacer and the outer spacers has been varied. The molecular structures of the target compounds were confirmed by Fourier transform infrared and proton nuclear magnetic resonance spectroscopy. The thermal phase behavior of the tetramers was investigated by polarizing optical microscopy and differential scanning calorimetry. All of the liquid-crystal tetramers showed either a chiral nematic mesophase or chiral nematic and smectic mesophases.
Observation of helical self-assembly in cyclic triphosphazene-based columnar liquid crystals bearing chiral mesogenic units
作者:Shruti Rani、Vidhika Punjani、Santosh Prasad Gupta、Madhu Babu Kanakala、C. V. Yelamaggad、Santanu Kumar Pal
DOI:10.1039/d2tc03847a
日期:——
function-integrated smart materials resulting from the spontaneous self-assembly of appropriately chosen functional molecules. Working in this direction, we have synthesized a new series of non-conventional, chiral columnar liquid crystals (Col LCs), where the cyclotriphosphazene core is surrounded by cholesterol-based Schiff base dimeric units. Cholesterol, which is covalently bound to the two-ring Schiff base
Nowadays, intensive research has focused on the design and synthesis of function-integrated smart materials resulting from the spontaneous self-assembly of appropriately chosen functional molecules. 朝着这个方向努力,我们合成了一系列新的非常规手性柱状液晶 (Col LC),其中环三磷腈核心被基于胆固醇的席夫碱二聚单元包围。胆固醇,通过以下方式共价结合到双环席夫碱核上一个不同长度和奇偶校验的柔性垫片,已被有预谋地结合起来,以在 Col 流体宏观结构中诱导手性。这些研究使用多种互补技术,清楚地揭示了间隔物的长度而不是奇偶性对由合成化合物的固有 Col 组装产生的 2D 晶格对称性的影响。通过详细的电子密度映射和小角/广角