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

Abstract

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.