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Solvent polarity effects on supramolecular chirality of a polyfluorene‐thiophene copolymer
Author(s) -
Hirahara Takashi,
YoshizawaFujita Masahiro,
Takeoka Yuko,
Rikukawa Masahiro
Publication year - 2018
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.22840
Subject(s) - polyfluorene , circular dichroism , chemistry , cotton effect , chirality (physics) , supramolecular chirality , thiophene , side chain , supramolecular chemistry , solvatochromism , conjugated system , solubility , copolymer , solvent effects , supramolecular assembly , solvent , acenaphthylene , photochemistry , alkyl , polymer chemistry , polymer , crystallography , organic chemistry , pyrene , crystal structure , chiral symmetry breaking , quantum mechanics , nambu–jona lasinio model , quark , physics
This study demonstrates the supramolecular chirality control of a conjugated polymer via solvent polarity. We designed and synthesized a chiral polyfluorene‐thiophene copolymer having two different chiral side chains at the 9‐position of the fluorene unit. Chiral cyclic and alkyl ethers with different polarities were selected as the chiral side chains. The sign of the circular dichroism spectra in the visible wavelength region was affected by the solvent system, resulting from the change of supramolecular structure. The estimation of the solubility parameter revealed that the solubility difference of the side chains contributed to the change of the circular dichroism sign, which was also observed in spin‐coated films prepared from good solvents having different polarities.