Foldamer Organogels: A Circular Dichroism Study of Glucose-Mediated Dynamic Helicity Induction and Amplification
作者:Wei Cai、Gui-Tao Wang、Ping Du、Ren-Xiao Wang、Xi-Kui Jiang、Zhan-Ting Li
DOI:10.1021/ja8043322
日期:2008.10.8
helicity induction in the gels, which is studied systematically by circular dichroism. The results are treated with the Avrami theory according to a reported method (J. Am. Chem. Soc. 2005, 127, 4336), which suggests that the gelation involves a nucleation-elongation mechanism. In addition, the "Sergeants and Soldiers" effect in the gel phase is also revealed.
本文报告了通过诱导手性葡萄糖从非手性氢键酰肼折叠体自组装手性有机凝胶的动态过程的系统研究。六个折叠体与六个癸基链和两个苯、萘、蒽或芘单元在末端结合,显示出强烈凝胶化非极性和极性溶剂,包括烷烃、芳烃、酯、醇和 1,4-二恶烷。凝胶通过紫外可见光、荧光、XRD、SEM 和 AFM 方法进行表征,在此基础上提出了一种错位的“尾对尾”堆积模式。由于强络合,辛基化葡萄糖的加入显着增强了折叠体凝胶化非极性溶剂的能力。络合还导致凝胶中独特的动态螺旋诱导,这是通过圆二色性系统研究的。根据报道的方法 (J. Am. Chem. Soc. 2005, 127, 4336) 用 Avrami 理论处理结果,这表明凝胶化涉及成核-伸长机制。此外,凝胶阶段的“中士和士兵”效果也显露出来。