A series of chiral bis(urea) compounds based on oligomethylene spacers with S-phenylethyl end groups have been investigated as low molecular weight gelators. The series shows gelation of a variety of liquids and their structural, morphological and rheological properties are reported. The bis(urea) compounds also act as supramolecular hosts for anions such as chloride and acetate and the weakening of the gels by competitive anion complexation on this series of archetypical, low molecular weight gels is reported. Modification of gel properties using gel mixtures is also described and the gelation process studied using a fluorescent napthyl analogue.
作为低分子量凝胶剂,我们研究了一系列基于带有 S-苯基乙基末端基团的低聚亚甲基间隔物的手性双(
脲)化合物。报告显示了该系列化合物对多种液体的凝胶作用及其结构、形态和流变特性。双(
脲)化合物还可作为
氯化物和
醋酸盐等阴离子的超分子宿主,报告了该系列典型的低分子量凝胶通过阴离子竞争性络合削弱凝胶的情况。此外,还介绍了利用凝胶混合物改变凝胶特性的方法,以及利用荧光
萘基类似物研究凝胶化过程的方法。