title: Control of the mechanical strength of a bipyridine-based polymeric gel from linear nanofibre to helix with a chiral dopant.
abstract: A mixture of building blocks 1 and 2 having hydrazine moieties and aldehyde moieties, respectively, formed a gel by a hydrazone reaction in the absence and presence of cyclohexane diamines as chiral dopants and Fe(2+). In particular, the mechanical strength of the helical gel prepared from 1 and 2 in the presence of a chiral dopant and Fe(2+) was ca. 10-fold stronger as compared to that of the gel prepared from the building blocks 1 and 2 without a chiral dopant and Fe(2+). The improved mechanical strength was attributed to the formation of a helix. The results indicate that the mechanical strength of gels obtained by hydrazone reaction could be controlled by a chiral dopant and Fe(2+).
authors.affiliation: Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju, Korea. jonghwa@gnu.ac.kr.
authors.forename: Heekyoung
authors.initials: H
authors.lastname: Choi
authors.forename: Junho
authors.initials: J
authors.lastname: Ahn
authors.forename: Sungmin
authors.initials: S
authors.lastname: Kim
authors.forename: Hyungjun
authors.initials: H
authors.lastname: Kim
authors.forename: Jong Hwa
authors.initials: JH
authors.lastname: Jung