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- Title
Guest-Induced Arylamide Polymer Helicity: Twist-Sense Bias and Solvent-Dependent Helicity Inversion.
- Authors
Zhang, Peng; Zhang, Liang; Wang, Ze ‐ Kun; Zhang, Yun ‐ Chang; Guo, Rong; Wang, Hui; Zhang, Dan ‐ Wei; Li, Zhan ‐ Ting
- Abstract
A benzene/naphthalene alternately incorporated amide polymer was synthesized and characterized. 1H NMR spectroscopy, fluorescence, and circular dichroism (CD) experiments indicated that, in chloroform, the polymer could be induced by the chiral l-aspartic acid dianion or one of its derivatives to form a helical tubular conformation with twist-sense bias. CD titration studies showed that the l-aspartic acid dianion (8 equiv.) could lead to a maximum Cotton effect. It was also revealed that the twist-sense bias obeyed the majority rule, and 70 % enantiomeric excess could realize the maximum helicity bias. Adding acetonitrile to the solution of chloroform caused inversion of the guest-induced helicity bias of the polymer.
- Subjects
POLYMERS; HELICITY (Chemistry); SOLVENTS; CIRCULAR dichroism; ASPARTIC acid; SOLUTION (Chemistry); CHLOROFORM
- Publication
Chemistry - An Asian Journal, 2016, Vol 11, Issue 11, p1725
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201600289