Banana‐shaped molecules with 4,6‐dichlorinated central core: effect of lateral substituents and terminal chains on the formation of antiferroelectric smectic mesophases

Autor:	Soon-Sik Kwon, Liang-Chy Chien, Sung-Tae Shin, Tae-Sung Kim, Chong-Kwang Lee, Wang-Choel Zin, Seung-Sock Choi, E-Joon Choi, Hong Choi, Jeong‐Kyu Park
Rok vydání:	2006
Předmět:	Materials science Substituent Mesophase General Chemistry Condensed Matter Physics chemistry.chemical_compound Crystallography Differential scanning calorimetry chemistry Liquid crystal Phase (matter) Halogen Antiferroelectricity Organic chemistry Molecule General Materials Science
Zdroj:	Liquid Crystals. 33:1005-1014
ISSN:	1366-5855 0267-8292
DOI:	10.1080/02678290600930865
Popis:	Six banana‐shaped compounds with a central core based on a 4,6‐dichloro‐1,3‐phenylene group were synthesized by varying the terminal chains (R = OC10H21 or OC11H21) and the lateral substituents (X = H, F or Cl). Their mesophases were characterized by a combination of differential scanning calorimetry, polarizing optical microscopy, triangular wave method, and X‐ray diffractometry. Mesomorphic properties of the banana‐shaped mesogens with an olefinic group (R = OC11H21) as a terminal chain are sensitive to lateral halogen substituents as much as those of the analogues with a saturated group (R = OC10H21). The compounds with X = F showed an antiferroelectric switchable smectic phase, which has been designated a B2 phase. The compounds without a lateral halogen substituent only formed a nematic phase, while the compounds with X = Cl did not exhibit a mesophase in the melt.
Databáze:	OpenAIRE
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