Banana-shaped molecules with 4,6-dichlorinated central core: effect of lateral substituents and terminal chains on the formation of antiferroelectric smectic mesophases
- Authors
- Kwon, Soon-Sik; Kim, Tae-Sung; Lee, Chong-Kwang; Choi, Hong; Shin, Sung-Tae; Park, Jeong-Kyu; Zin, Wang-Choel; Chien, Liang-Chy; Choi, Seung-Sock; Choi, E-Joon
- Issue Date
- Sep-2006
- Publisher
- TAYLOR & FRANCIS LTD
- Citation
- LIQUID CRYSTALS, v.33, no.9, pp 1005 - 1014
- Pages
- 10
- Journal Title
- LIQUID CRYSTALS
- Volume
- 33
- Number
- 9
- Start Page
- 1005
- End Page
- 1014
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/26798
- DOI
- 10.1080/02678290600930865
- ISSN
- 0267-8292
1366-5855
- Abstract
- 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 B-2 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.
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