title: Synthesis of helical polyacetylene in chiral nematic liquid crystals using crown ether type binaphthyl derivatives as chiral dopants.
abstract: A series of crown ether type binaphthyl derivatives (CEBDs) were synthesized and used as chiral dopants to induce chiral nematic (N*) liquid crystals (LCs). The twisting powers of the CEBDs for phenylcyclohexane (PCH)-derived nematic LCs were evaluated. It was found that the twisting powers of the CEBDs increased with decreasing ring size of the crown ether. Helical polyacetylenes were synthesized in the N*-LCs induced by the CEBDs. The relationship between the morphology of the helical polyacetylene and the helical structure of the N*-LC was investigated. The result showed that the interdistance between the fibril bundles of the helical polyacetylene was equal to a half-helical pitch of the N*-LC and the screw direction of the polyacetylene fibrils was opposite to that of the N*-LC.
authors.affiliation: Institute of Materials Science, University of Tsukuba, Ibaraki 305-8573, Japan. akagi@ims.tsukuba.ac.jp
authors.forename: Kazuo
authors.initials: K
authors.lastname: Akagi
authors.forename: Shouxue
authors.initials: S
authors.lastname: Guo
authors.forename: Taizou
authors.initials: T
authors.lastname: Mori
authors.forename: Munju
authors.initials: M
authors.lastname: Goh
authors.forename: Guangzhe
authors.initials: G
authors.lastname: Piao
authors.forename: Mutsumasa
authors.initials: M
authors.lastname: Kyotani
mesh_terms: D000114:Acetylene / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D003460:Crystallization; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D008958:Models, Molecular; D015394:Molecular Structure; D009284:Naphthols / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D053279:Polyynes; D012399:Rotation
chemical_list: D009284:Naphthols; D011108:Polymers; C422409:liquid crystal polymer; D053279:Polyynes; D000114:Acetylene