首页|Chirality transfer from atropisomeric cMral inducers to nematic and smectic liquid crystals - synthesis and characterization of di- and tetra-substituted axially chiral Mnaphthyl derivatives
Chirality transfer from atropisomeric cMral inducers to nematic and smectic liquid crystals - synthesis and characterization of di- and tetra-substituted axially chiral Mnaphthyl derivatives
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NSTL
Royal Soc Chemistry
The chirality transfer of axially chiral binaphthyl derivatives bearing liquid crystal (LC) moieties at the n,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 with phenylbenzoate 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, PhBl or PhB2 with the chiral dopant, D-3,3' or D-6,6' shows chiral smectic LCs C (Sc*-LCs). The highly twisted S_c~* phases with helical pitches of 1.2-1.4 μm are prepared in PhBl 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.
Munju Goh、Jinwoo Park、Yehdong Han
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Department of Polymer Chemistry, Kyoto University, Katsura, Kyoto 615-8510, Japan.
NSTL
Royal Soc Chemistry
