Chiral Gelators Constructed from 11-Aminoundecanoic (AUDA), Lauric and Amino Acid Units. Synthesis, Gelling Properties and Preferred Gelation of Racemates vs. the Pure Enantiomers
作者:Vesna Čaplar、Mladen Žinić、Jean-Luc Pozzo、Frederic Fages、Gudrun Mieden-Gundert、Fritz Vögtle
DOI:10.1002/ejoc.200400105
日期:2004.10
being able to form gels both with highly polar solvents (water, DMSO) and also with highly lipophilic solvents, including two hydrocarbon fuels. At variance with several recent observations that the enantiomers are generally more efficient gelators than the corresponding racemates, some of the racemic gelators prepared in this work were found to be capable of gelling up to 16 times larger volumes of
通过在同一分子中结合 11-氨基十一烷酸 (AUDA)、月桂酸和芳香族和脂肪族氨基酸单元,设计了一类新的高效低分子量凝胶剂分子。这产生了一类特殊的具有核心手性中心和氢键位点的脂肪酸两亲物。一些具有末端羧酸和羧酸钠官能团的化合物表现出灵巧的凝胶化特性,能够与高极性溶剂(水、DMSO)和高度亲油性溶剂(包括两种碳氢燃料)形成凝胶。与最近的一些观察结果不同,即对映异构体通常比相应的外消旋体更有效,发现在这项工作中制备的一些外消旋胶凝剂能够使某些溶剂的体积比纯对映异构体大 16 倍。由具有末端羧酸基团的衍生物和亲脂性溶剂形成的凝胶的温度依赖性 FTIR 和 1H NMR 研究表明,酰胺和羧酸单元之间的分子间氢键参与了凝胶聚集体的自组装。在具有末端羧酸钠基团的凝胶剂中观察到聚集体的额外强稳定性,这归因于羧酸钠基团之间的静电和离子偶极相互作用。与由具有末端羧酸基团的凝胶剂形成的凝胶相比,这种额外的稳定