대한화학회지 (Journal of the Korean Chemical Society)

  • 제42권3호
  • /
  • Pages.315-322
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  • 1998
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  • 1017-2548(pISSN)
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  • 2234-8530(eISSN)
대한화학회 (Korean Chemical Society)
권호 표지

새로운 H-자형 이메소겐 화합물의 액정특성에 치환기가 미치는 효과

The Effect of Substituents on the Liquid Crystalline Behavior of New H-Shaped Dimesogenic Conpounds

  • 발행 : 19980600
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초록

새로운 에메소겐 액정화합물들을 합성하였고, 이들의 열적 및 액정 성질을 DSC와 가열판이 부착된 편광현미경을 사용하여 조사하였다. 이 화합물들 즉, 1,10-bis[2,5-bis(4-substitutedphenoxycarbonyl)phenoxy]decane은 "H-자형" 이합체 대칭화합물의 구조로 중앙의 테페프탈로일 단위에 oxydecamethyleneoxy 격자를 통하여 상호 연결된 두 개의 bis(p-substitutedphenoxy)terephthalate 단위로 이루어졌다. 메소겐의 치환기는 X=-F, -H, -I, -Cl, -Br, $-NO_2,\;-CF_3,\;-OC_4H_9-CN$ 및 $-C_6H_5$를 바꾸어 보았다. $X=-OC_4H_9-CN$과 $C_6H_5$ 화합물은 단방성 네마틱액정이었으며 이에 비하여 X=-F, -H, -I, -Cl, -Br, $-NO_2$와 $-CH_3$는 액정이 아니었다. 이 화합물들의 네마틱 그룹 효율은 $-C_6H_5>-CN>-OC_4H_9$ 순이었다.

A series of new dimesogenic compounds were prepared and their thermotropic and liquid crystalline properties were studied by differential scanning calorimetry and on a hot-stage of a polarizing microscope. These compounds, 1,10-bis[2,5-bis(4-substitutedphenoxycarbonyl)phenoxy]decanes, consist of two bis(ρ-substitutedphenoxy)terephthalate units interconnected through a oxydecamethyleneoxy spacer on the central terephthaloyl units resulting in the structure of "H-shaped" dimeric twin compounds. The terminal substitutent groups were changed; X=-F, -H, -I, -Cl, -Br, $-NO_2,\;-CF_3,\;-OC_4H_9,\;-CN\;and\;-C_6H_5.$ The compounds with X=$-OC_4H_9,\;-CN\;and\;-C_6H_5$ were monotropically nematic. In contrast, the compounds with $X=-F, -H, -I, -Cl, -Br, $-NO_2\;and\;-CF_3$ were non-liquid crystals. The nematic group efficiency of these compounds was in the order of -C_6H_5>-CN>-OC_4H_9.$

키워드

참고문헌

  1. Liquid Crystals Saeva, F. D.
  2. Introduction to Liquid Crystals Collings, P. J.;Hird, M.
  3. Liquid Crystals - Applications and Uses Bahadur, B.
  4. Advances in Liquid Crystal Research and Applications Bata, L.
  5. Flussige Kristalle in Tabellen Demus, D.;Demus, H.;Zaschke, H.
  6. Flussige Kristalle in Tabellen Ⅱ Demus, D.;Zaschke, H.
  7. J. Org. Chem. v.35 no.8 Dewar, M. J. S.;Goldberg, R. S.
  8. Mol. Cryst. Liq. Cryst. v.17 Knaak, L. E.;Rosenberg, H.
  9. J. Org. Chem. v.38 no.18 Schroeder, J. P.;Bristol, D. W.
  10. Mol. Cryst. Liq. Cryst. v.89 Neubert, M. E.;Stahl, M. E.;Cline, R. E.
  11. Bull. of Korean Chem. Soc. v.4 no.4 Jin, J. I.;Kang, J. S.;Jo, B. W.;Lenz, R. W.
  12. Bull. of Korean Chem. Soc. v.4 no.3 Jin, J. I.;Chung, Y. S;Lenz, R. W.;Ober, C.
  13. Mol. Cryst. Liq. Cryst. v.110 Jin, J. I.;Park, J. H.
  14. Bull. of Korean Chem. Soc. v.6 no.1 Jin, J. I.;Seong, C. M.;Jo, B. W.
  15. Bull. of Korean Chem. Soc. v.11 no.4 Jo, B. W.;Choi, J. K.;Jin, J. I.;Chung, B. Y.
  16. Mol. Cryst. Liq. Cryst. v.267 Jin, J. I.
  17. J. Am. Chem. Soc. v.103 Griffin, A.C.;Britt, T. R.
  18. J. Chem. Soc. Perkin Trans. v.Ⅱ Jin, J. I.;Oh, H. T.;Park, J. H.
  19. Bull. of Korean Chem. Soc. v.12 no.5 Jin, J. I.;Chung, B. Y.;Park, J. H.
  20. Liq. Cryst. v.12 no.2 Date, R. W;Imrie, C. T.;Luckhurst, C. G.;Seddon, J. M.
  21. Liq, Cryst. v.16 no.4 Attard, G. S.;Date, R. W.;Imrie, C. T.;Luckhurst, G. R.;Roskilly, S. J.;Seddon, J. M.;Taylor, L.
  22. Cryst. Res. Technol. v.19 Weissfolg, W.;Demus, D.
  23. Mol. Cryst. Liq. Cryst. Jin, J. I.;Kim, J. S.;Yun, Y. K.;Chin, W. C.
  24. J. Chem. Soc. Byron, D. J.;Gray, G. W.;Worrall, B. M.
  25. Nouv. J. Chim. v.3 Griffin, A.;Steel, M. L.;Johnson, J. F.;Bertolini, G. J.
  26. Mol. Cryst. Liq. Cryst. v.64 Griffin, A. C.;Buckley, N. W.;Hughes, W. E.;Wertz, D. L.
  27. Liq. Cryst. v.6 Dehne, H.;Roger, A.;Demus, D.;Diele, S.;Kresse, H.;Pelzl, G.;Wedler, W.
  28. Liq. Cryst. v.5 Weissflog, W.;Demus, D.;Diele, S.;Nitschke, P.;Wedler, W.
  29. Purification of Laboratory Chemicals (4th Ed.) Armarego, W. L. F.;Perrin, D. D.
  30. Univ. Ser. Ⅱ, Khim. v.16 Vestnik Moskov
  31. Brit. J. Pharmacol. v.11 Collier, J;Chsher, G. B.
  32. J. Am. Chem. Soc. v.80 Burkhard, C. A.;Burnett, R. E.
  33. Textures of Liquid Crystals Demus, D.
  34. Mater. Chem. v.1 no.3 Wedler, W.;Demus, D.;Zaschke, H.;Mohr, K.;Sch fer, W.;Weissflog, W. J.
  35. Crystal Res. Techn. v.16 no.10 Wiegeleben, A.;Marzotko, D.;Demus, D.
  36. Liquid Crystals and Plastic Crystals v.1 Gray, G. W.;Winsor, P. A.(Eds.)
  37. J. Am. Chem. Soc. v.92 no.6 Dewar, M. J. S.;Goldberg, R. S.
  38. J. Org. Chem. Soc. v.35 no.8 Dewar, M. J. S.;Goldberg, R. S.
  39. Mol. Cryst. Liq. Cryst. v.82 Jin, J. I.;Chung, Y. S.;Kang, J. S.;Lenz, R. W.
  40. J. Org. Chem v.38 no.18 Schroeder, J. P.;Bristol. D. W.
  41. Mol. Cryst. Liq. Cryst. v.51 Byron, D. J.;Lacey, D.;Wilson, R. C.