Solid phase peptide synthesis (SPPS) has been used as a synthetic tool to prepare monodisperse mesogen–oligopeptide conjugates with novel molecular architectures. Building upon previous success in this area, we have extended our methodologies to include a mesogenically substituted l-glutamic acid residue, and incorporated this derivative, as well as the l-lysine derivative previously reported, into a variety of new structures. Some novel liquid crystalline materials have been discovered. Bothalpha;-helical and beta;-sheet secondary structures have been explored as alternative scaffolds for the pendant mesogenic groups. The helical systems show most promise in terms of their ease of synthesis and handling, but at the relatively lower levels of mesogenic substitution studied so far, compared to the previously reported homo-oligopeptide materials, mesophases are not observed. The beta;-sheet materials prepared are rather insoluble and too high melting to have any practical value as thermotropic materials without further manipulation of their structures.
固相肽合成(
SPPS)被用作一种合成工具,用于制备具有新型分子结构的单分散介源寡肽共轭物。在这一领域取得成功的基础上,我们将方法扩展到中源取代的 l-谷
氨酸残基,并将这种衍
生物以及之前报道过的 l-赖
氨酸衍
生物加入到各种新结构中。发现了一些新型液晶材料。我们探索了α-螺旋和β-片状二级结构,作为悬垂介原基团的替代支架。螺旋系统在易于合成和处理方面最有前途,但与以前报道的同寡肽材料相比,目前研究的介原取代
水平相对较低,没有观察到介相。制备出的β-片状材料相当不溶解,熔点过高,如果不对其结构进行进一步处理,作为热致性材料将没有任何实用价值。