Nanopatterned Superlattices in Self-Assembled<i>C</i><sub>2</sub>-Symmetric Oligodimethylsiloxane-Based Benzene-1,3,5-Tricarboxamides
作者:Miguel García-Iglesias、Bas F. M. de Waal、Isja de Feijter、Anja R. A. Palmans、E. W. Meijer
DOI:10.1002/chem.201404375
日期:2015.1.2
The synthesis of C3‐ and C2‐symmetric benzene‐1,3,5‐tricarboxamides (BTAs) containing well‐defined oligodimethylsiloxane (oDMS) and/or alkyl side chains has been carried out. The influence of the bulkiness of the oDMS chains in the aggregation behavior of dilute solutions of the oDMS‐BTAs in methylcyclohexane was studied by temperature‐dependent UV spectroscopy. The formation of hierarchically self‐assembled
包含明确定义的低聚二甲基硅氧烷(o DMS)和/或烷基侧链的C 3-和C 2-对称苯-1,3,5-三羧酸酰胺(BTA )的合成。通过温度依赖性紫外光谱研究了o DMS链的庞大度对o DMS-BTAs稀溶液在甲基环己烷中的聚集行为的影响。在不同的BTA浓度下观察到分层自组装聚集体的形成,聚集趋势通过缩短或去除o而增加。DMS链。手性BTA用圆二色性(CD)光谱进行了研究,显示出比非手性BTA更强的聚集趋势。多数规则实验表明,线性行为与高失配罚分能量的存在相一致。最有效的o DMS-BTAs有机胶凝剂能够在5 mg mL -1的条件下形成稳定的有机凝胶(0.75重量%)的己烷溶液。固态表征技术表明,在形成热致液晶的相邻分子之间形成了分子间三重氢键,从室温到150°C以上均呈六方柱状组织。当增加低聚二甲基硅氧烷链的数目和长度时,观察到澄清温度降低。除了三重氢键导致柱状液晶相外,o DMS和脂族链之间的分离还发生在被两个烷基和一个o