A highly stable double helix of aromatic oligoamide comprised of fused ring aromatic units
作者:Quan Gan、Jie Shang、Brice Kauffmann、Ying Wang、Fusheng Bie、Hua Jiang
DOI:10.1016/j.tet.2011.11.081
日期:2012.6
Aromatic oligoamides of 2,6-diaminofluorobenzene and 1,8-diazafluoroanthrancene-2,7-diacid have been synthesized by a convergent method. The heptameric oligoamide can not only fold into a single helix but also hybridize into a highly stable double helix through intensive intermolecular aromatic stackings, which has been extensively characterized in the solid state by single crystal X-ray diffractions
通过收敛法合成了2,6-二氨基氟苯和1,8-二氮氟蒽并-2,7-二酸的芳族低酰胺。七聚寡酰胺不仅可以折叠成单个螺旋,而且还可以通过密集的分子间芳族堆积与高度稳定的双螺旋杂交,而在固态中,通过单晶X射线衍射和1 H NMR可以广泛地表征其特征, NOESY和UV / vis光谱。在室温下,七聚体的K dim值在10 7 L mol -1以上。广泛的链间相互作用,增大的直径(5.4Å)和较小的扭转角(13°)使七聚体1 基于类似弹簧的延伸机制,很容易杂交成高度稳定的双螺旋。