Mechanism of Helix Induction in Poly(4-carboxyphenyl isocyanide) with Chiral Amines and Memory of the Macromolecular Helicity and Its Helical Structures
作者:Yoko Hase、Kanji Nagai、Hiroki Iida、Katsuhiro Maeda、Noriaki Ochi、Kyoichi Sawabe、Koichi Sakajiri、Kento Okoshi、Eiji Yashima
DOI:10.1021/ja904128d
日期:2009.8.5
and DMSO-water mixtures containing less than 30 vol % water could not maintain the optical activity after removal of the chiral amines (poly-1a-H). We now report fully detailed studies of the helix induction mechanism with chiral amines and the memory of the macromolecular helicity in water and a DMSO-water mixture by various spectroscopic measurements, theoretical calculations, and persistence length
在二甲基亚砜 (DMSO) 和水中与光学活性胺络合后,一种光学惰性的聚(4-羧基苯基异氰化物)(poly-1-H)将其结构转变为主要的单手螺旋结构,并且该配合物显示出诱导的特征聚合物骨架区域的圆二色性。此外,即使在完全去除手性胺(h-poly-1b-H)后,水和含水量超过 50% 的有机水溶液中诱导的大分子螺旋性也可以“记忆”,而在 DMSO 和 DMSO-在去除手性胺(poly-1a-H)后,含水量低于 30 vol% 的水混合物无法保持旋光性。我们现在通过各种光谱测量、理论计算和持久长度测量以及 X 射线衍射 (XRD) 报告对手性胺的螺旋诱导机制以及水和 DMSO-水混合物中大分子螺旋度的记忆的全面详细研究测量。从poly-1a-H、h-poly-1b-H和原始poly-1-H的光谱结果,如圆二色性(CD)、吸收、IR、振动CD和NMR,我们得出结论: C水平线N双键周围的构型异构化