title: Reversible transformation between rings and coils in a dynamic hydrogen-bonded self-assembly.
abstract: Several proteins, such as tobacco mosaic virus coat protein and the beta protein of the bacteriophage lambda, are known to exhibit unique dynamic self-organization processes involving ring-shaped and extended helical nanostructures triggered by chemical stimuli. However, transformation of rings into coils as observed in biological assemblies has never been realized with synthetic molecular building blocks. Oligo(p-phenylenevinylene) functionalized on one end with barbituric acid and on the other end with aliphatic tails self-organizes in aliphatic solvents to form nanorings through hydrogen-bonding and pi-stacking interactions. Upon an increase in concentration, the nanorings transform into rodlike nanostructures, which are considered to be formed through helically coiled objects consisting of quasi-one-dimensional fibers.
authors.affiliation: Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. yagai@faculty.chiba-u.jp
authors.forename: Shiki
authors.initials: S
authors.lastname: Yagai
authors.forename: Shun
authors.initials: S
authors.lastname: Kubota
authors.forename: Hikaru
authors.initials: H
authors.lastname: Saito
authors.forename: Kanako
authors.initials: K
authors.lastname: Unoike
authors.forename: Takashi
authors.initials: T
authors.lastname: Karatsu
authors.forename: Akihide
authors.initials: A
authors.lastname: Kitamura
authors.forename: Ayyappanpillai
authors.initials: A
authors.lastname: Ajayaghosh
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Kanesato
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kikkawa