title: Creation of circularly polarized luminescence from an achiral polyfluorene derivative through complexation with helix-forming polysaccharides: importance of the meta-linkage chain for helix formation.
abstract: A circularly polarized luminescence (CPL) material has been created by polymer-polymer complexation between a helix-forming polysaccharide, schizophyllan (SPG), and a meta-phenylene-linked polyfluorene derivative (mPFS). Computational modeling revealed that mPFS can adopt a helical structure although a conventional polyfluorene derivative with a para-phenylene linkage tends to enjoy a rigid rodlike conformation. Our detailed experimental examination showed that mPFS forms a chiral nanowire complex through cohelix formation with SPG. We have found, as expected, that this cohelical complex emits highly efficient CPL even in an aqueous solution. The appearance of the high CPL property is due to 1) a high quantum yield of the fluorene unit and 2) immobilization of the helically twisted conformation of mPFS in an isolated manner through cohelix formation with SPG. One can propose, therefore, that the SPG/mPFS complex acts as a new high-performance CPL material with a solvent-dispersible nanowire structure.
authors.affiliation: Nanotechnology Laboratory, Institute of Systems, Information Technologies and Nanotechnologies (ISIT), 203-1 Moto-oka, Nishi-ku, Fukuoka, 819-0385 (Japan), Fax: (+81) 92-805-3814; Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395 (Japan).
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Shiraki
authors.forename: Youichi
authors.initials: Y
authors.lastname: Tsuchiya
authors.forename: Takao
authors.initials: T
authors.lastname: Noguchi
authors.forename: Shun-ichi
authors.initials: S
authors.lastname: Tamaru
authors.forename: Nozomu
authors.initials: N
authors.lastname: Suzuki
authors.forename: Makoto
authors.initials: M
authors.lastname: Taguchi
authors.forename: Michiya
authors.initials: M
authors.lastname: Fujiki
authors.forename: Seiji
authors.initials: S
authors.lastname: Shinkai
keywords: carbohydrates; chirality; luminescence; polymers; supramolecular chemistry