NDLI: Mesophasic helical structures with high twisting power in optically active 3-methyladipic acid bis esters

Content Provider	Royal Society of Chemistry (RSC)
Author	Yoshizawa, Atsushi Nishiyama, Isa
Copyright Year	1994
Abstract	A homologous series of novel twin molecules, (R)-3-methyladipic acid bis[4-(5-alkyl-2-pyrimidinyl)phenyl] ester, has been prepared and the physical properties investigated, where the chirality was generated in the system by introducing the chiral centre in the central region of the molecular structure. Heptyl and octyl members of the series show a monotropic cholesteric phase. The chirality-dependent properties of the series of the twin materials were compared with those of analogous ‘monomeric’ materials carrying a chiral centre in the peripheral aliphatic chain. Pitch measurements revealed that the twin materials induce a strong helical structure in both cholesteric and chiral smectic C phases. Furthermore, a chiral twin molecule possessing only one phenyl ring at each core part, i.e.(R)-3-methyladipic acid bis(4-octyloxyphenyl) ester, was prepared. The Sc pitch of this compound was found to be longer than that for the former series of twin materials. These results allow us to propose a possible model for producing the strong helical structure in the Sc phases where the chirality had been induced by the twin molecules. In addition, the strong desire for the twin materials to form a helical ordering in smectic phases was also found to induce an unusual smectic phase, in contact studies with an achiral liquid-crystalline material, where a texture similar to that reported for the twist grain boundary (TGB) phases was observed.
Starting Page	449
Ending Page	456
Page Count	8
File Format	PDF
ISSN	09599428
Volume Number	4
Issue Number	3
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9940400449
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	TGB Homologous series Carboxylic acid Alkyl Phenyl group Ester Chirality Stereocenter Liquid crystal Aliphatic compound
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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