(carboxylic acid versus sodium carboxylate), and stereochemistry (racemateversus optically pure form) allowed the identification of gelators with tremendously improved versatility (Gver) and effectiveness (Geff). Dramatic differences in Geff values of up to 70 times could be observed between pureracemate/enantiomer pairs of some gelators, which were manifested even in the gelation of very similar
设计了由脂肪酸,氨基酸(苯甘氨酸)和ω-氨基脂肪族酸单元组成的低分子量胶凝剂分子。通过分别改变描述符m和n所定义的脂族和ω-氨基脂族酸链中亚甲基单元的数目,获得了一系列位置异构体胶凝剂,它们在胶凝剂分子中的肽氢键合单元的位置不同。位置异构体的胶凝特性已针对一组定义的二十种不同结构和极性的溶剂进行了测定,并根据胶凝剂的多功能性(G ver)和有效性(G eff)进行了分析。)。凝胶试验的结果表明,通过改变m和n,端基极性(羧酸对羧酸钠)和立体化学(外消旋体对光学纯形式)的简单合成优化,“铅凝胶剂分子”就可以鉴定出大大提高了通用性(G ver)和有效性(G eff)的胶凝剂。在某些胶凝剂的纯外消旋体/对映异构体对之间,可以观察到高达70倍的G eff值显着差异,甚至在非常相似的溶剂(如二甲苯异构体)的胶凝中也能表现出这种差异。光谱的综合结果(11 H NMR,FTIR),电子显微镜(TEM)和