writer：Junyan Zhu, Zeyuan Dong,* Shengbin Lei, Lili Cao, Bing Yang, Wenfang Li, Yuanchao Zhang,Junqiu Liu,*
keywords：aromatic polymers · dimerization ·helical structures
source：期刊
Issue time：2015年
From scanning tunneling microscopy (STM) images of rationally designed helical polymers with a pattern of pi–pi stacking, we successfully identified the single- and double-helical superstructures. The STM images of the helical structures revealed the smallest helical architecture (diameter ca. 1.3 nm) that has been seen so far. Furthermore, the interconversion of single and double helices was further underpinned by experimental analyses. Significantly, the formation of double helices induced different supramolecular chirality to that observed for the single helices.