Abstract
Optically active poly(diphenylacetylene) derivatives, poly(4-((S)-2-methoxyoctyloxy)diphenylacetylene) (poly-1), poly(4-((S)-2-triethylsiloxyoctyloxy)diphenylacetylene) (poly-2), and poly(4-((S)-2-hydoxyoctyloxy)diphenylacetylene) (poly-3), were successfully synthesized and were examined about their chiroptical and liquid crystalline properties. The mirror image of circular dichroic (CD) spectra of poly-1 and poly-2 in dilute solution indicated that their polymer backbones adopted a helical conformation with the opposite handedness. Poly-3 prepared from poly-2 by deprotection of a triethylsilyl group showed the same helical handedness with poly-2. Poly-1−poly-3 had a lyotropic liquid crystalline property while thermotropic liquid crystalline behavior was observed for poly-1 and poly-3. Poly-1−poly-3 spin-cast films showed a strong bisignate CD signal centered at absorption band of polymer backbone, which suggested the formation of a chiral organization. Thermal annealing enhanced the induced chirality in poly-3 film and inversed the induced chirality in poly-1 film. Simple exposure to organic solvent vapor also enhanced the induced chirality in poly-1−poly-3 films. Furthermore, the intensity of induced chirality in poly-3 film was reversibly controlled by exposing to appropriate solvent vapor alternately.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
