title: Induction and control of supramolecular chirality by light in self-assembled helical nanostructures.
abstract: Evolution of supramolecular chirality from self-assembly of achiral compounds and control over its handedness is closely related to the evolution of life and development of supramolecular materials with desired handedness. Here we report a system where the entire process of induction, control and locking of supramolecular chirality can be manipulated by light. Combination of triphenylamine and diacetylene moieties in the molecular structure allows photoinduced self-assembly of the molecule into helical aggregates in a chlorinated solvent by visible light and covalent fixation of the aggregate via photopolymerization by ultraviolet light, respectively. By using visible circularly polarized light, the supramolecular chirality of the resulting aggregates is selectively and reversibly controlled by its rotational direction, and the desired supramolecular chirality can be arrested by irradiation with ultraviolet circularly polarized light. This methodology opens a route to ward the formation of supramolecular chiral conducting nanostructures from the self-assembly of achiral molecules.
authors.affiliation: Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
authors.forename: Jisung
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
authors.forename: Jinhee
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Mechanical Engineering, KAIST, Daejeon 305-701, Korea.
authors.forename: Woo Young
authors.initials: WY
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
authors.forename: Hyungjun
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
authors.forename: Sanghwa
authors.initials: S
authors.lastname: Lee
authors.affiliation: Department of Electronic Engineering, KAIST, Daejeon 305-701, Korea.
authors.forename: Hee Chul
authors.initials: HC
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
authors.forename: Yoon Sup
authors.initials: YS
authors.lastname: Lee
authors.affiliation: Graduate School of Nanoscience and Technology, KAIST, Daejeon 305-701, Korea.
authors.forename: Myungeun
authors.identifier: 0000000252183502
authors.initials: M
authors.lastname: Seo
authors.affiliation: Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
authors.forename: Sang Youl
authors.initials: SY
authors.lastname: Kim