Effect of the variation of swallow-tailed groups on the mesomorphic and electro-optical properties of chiral compounds derived from (S)-2-(6-hydroxy-2-naphthyl)propionic acid
Titel:
Effect of the variation of swallow-tailed groups on the mesomorphic and electro-optical properties of chiral compounds derived from (S)-2-(6-hydroxy-2-naphthyl)propionic acid
Auteur:
Wu, S. -L. Lu, F. -C.
Verschenen in:
Liquid crystals
Paginering:
Jaargang 31 (2004) nr. 11 pagina's 1517-1523
Jaar:
2004-11
Inhoud:
Three homologous series of chiral swallow-tailed compounds, alkyl (S)-2-{6-[4-(4'-alkoxyphenyl)benzoyloxy]-2-naphthyl}propionates, (S)HNP(p,n,q) derived from (S)-2-(6-hydroxy-2-naphthyl)propionic acid in conjugation with a variety of swallow-tailed groups, attached to the external side of the chiral centre, have been synthesized and their mesomorphic and electro-optical properties studied. Both (S)HNP(p,1,2) and (S)HNP(p,1,3) exhibited an enantiotropic antiferroelectric SmCA* phase. This implys that the swallow-tailed groups in the molecules favour zigzag pairing of the molecules in the smectic phase. The maximum PS values of compounds (S)HNP(p,1,2) in the antiferroelectric phase were measured in the range 21-30 nC cm-2; those of compounds (S)HNP(p,1,3) were in the range 15-23 nC cm-2, indicating that these chiral compounds possess low polarity. The electro-optical response of the compounds in the antiferroelectric SmCA* phase displayed thresholdless V-shaped switching.
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