Chirality transfer from atropisomeric chiral inducers to nematic and smectic liquid crystals – synthesis and characterization of di- and tetra-substituted axially chiral binaphthyl derivatives

• Goh, Munju

• Park, Jinwoo

• Han, Yehdong

• Ahn, Sangbum

• 赤木, 和夫

抄録

The chirality transfer of axially chiral binaphthyl derivatives bearing liquid crystal (LC) moieties at then, n′ positions (n = 3, 4, 6) of the binaphthyl rings to nematic (N) and smectic (S) LCs is investigated. Chiral nematic LCs (N[*]-LCs) are prepared by adding a small amount of the chiral binaphthyl derivative into host N-LCs composed of cyanobiphenyl mesogen cores. The binaphthyl derivative with phenylcyclohexyl (PCH) type LC moieties at the 4, 4′ positions of the binaphthyl ring [D-4, 4′] exhibits a low helical twisting power (HTP) of 11 μm[−1]. In contrast, those with LC moieties at the 3, 3′ and 6, 6′ positions of the binaphthyl rings [D-3, 3′ and D-6, 6′] exhibit high HTPs of 153 μm[−1] and 154 μm[−1], respectively. Next, the binaphthyl derivatives are added into two types of S-LCs withphenylbenzoate mesogen cores: 4-(4-methylpentyloxy)phenyl-4-(decyloxy)benzoate [PhB1] and 4-(3-methylpentyloxy)phenyl-4-(decyloxy)benzoate [PhB2]. The mixture of the host LC, PhB1 or PhB2with the chiral dopant, D-3, 3′ or D-6, 6′ shows chiral smectic LCs C (SC[*]-LCs). The highly twisted SC[*] phases with helical pitches of 1.2–1.4 μm are prepared in PhB1 and PhB2 by using the chiral dopant of D-6, 6′. It is concluded that D-6, 6′ has a large helical twisting power and is the most favourable atropisomeric chiral inducer for chirality transfer to both N-LCs and S-LCs.

収録刊行物

• Journal of Materials Chemistry

  Journal of Materials Chemistry 22 (48), 25011-25018, 2012-10

  Royal Society of Chemistry

詳細情報

• CRID: 1050845760713483520
• NII論文ID: 120005394739
• NII書誌ID: AA10822442
• ISSN: 09599428
• HANDLE: 2433/182949
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles