- 著者
- Kawabata Kohsuke Goto Hiromasa
- 出版者
- Royal Society of Chemistry
- 雑誌
- Journal of materials chemistry (ISSN:09599428)
- 巻号頁・発行日
- vol.22, no.44, pp.23514-23524, 2012-09
- 被引用文献数
- 20 4
A series of axially chiral 1,1-binaphthyl–thiophene copolymers were synthesized by Migita–Kosugi–Stille polycondensation and electrochemical polymerization. The polymers exhibit circular dichroism not only in the ultraviolet region but also in the visible region, both in solution and film states. Optical and electrochemical properties of the polymers are in good agreement with theoretical results obtained by density functional theory calculations. Although effective conjugation of the polymers was cleaved at the orthogonally oriented two naphthalene rings in the 1,1-binaphthyl unit, the electrochemically synthesized polymer film shows good electrochemical redox behavior with repeatable changes in optical absorption and circular dichroism. The changes in circular dichroism may reflect a change in the dihedral angle of the binaphthyl unit caused by reorientation of conjugated main chains between oxidized and neutral states.
- 著者
- Hayashi Hitoshi Wang Aohan Kawabata Kohsuke Goto Hiromasa
- 出版者
- Elsevier
- 雑誌
- Materials chemistry and physics (ISSN:02540584)
- 巻号頁・発行日
- vol.137, no.3, pp.816-824, 2013-01
- 被引用文献数
- 11
A series of chiral three-ring type compounds with rigid shape was employed as chiral inducers for induction of chiral cholesteric liquid crystal (cholesteric LC) from achiral nematic LC. Helical twisting power of the chiral compounds was estimated with the Cano wedge method. Cholesteric LC electrolyte solution was prepared by adding the chiral compounds. Subsequently, polymerization in the cholesteric LC was carried out to produce chiroptically active polymer films. This method is different from conventional methods for synthesizing chiral polymers because neither chiral monomers nor asymmetric catalysts are employed. Surface structure and optical properties of the polymer thus prepared were examined.