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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
Author(s) -
Shiraki Tomohiro,
Tsuchiya Youichi,
Noguchi Takao,
Tamaru Shunichi,
Suzuki Nozomu,
Taguchi Makoto,
Fujiki Michiya,
Shinkai Seiji
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201301216
Subject(s) - polyfluorene , helix (gastropod) , luminescence , quantum yield , phenylene , materials science , derivative (finance) , crystallography , hydrodynamic radius , chemistry , stereochemistry , polymer , photochemistry , copolymer , fluorescence , organic chemistry , physics , optics , optoelectronics , ecology , snail , economics , financial economics , biology
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.