Mesomorphic and dielectric properties of esters useful for formulation of nematic mixtures for dual frequency addressing system

• Autorzy: Ziobro D. , Kula P. , Dziaduszek J. , Filipowicz M. , Dąbrowski R. , Parka J. , Czub J. , Urban S. S. , Wu S. T.
• Języki publikacji: EN

Abstrakty

EN

Mesomorphic and dielectric properties of three homologous series of two and three ring fluorosubstituted esters are described. They are 4-cyano-3-fluorophenyl 4-alkyloxy-2-fluorobenzoates, 4-cyano-3-fluorophenyl 4-(4-alkylbenzoyloxy)-2-fluorobenzoates and 3-fluoro-4-cyanophenyl, or 3-fluoro-4-isothiocyanatophenyl or 3,4-difluorophenyl 4'-alkyl-2,3-difluoro-biphenyl-4-carboxylates. The compounds exhibit the nematic mesophase accompanied by the smectic A or smectic C mesophase in some cases. Most of them show strong dependence of the dielectric anisotropy Δ ε upon frequency, at low frequencies Δ ε reaches a value ∼ 200, while at high frequencies a small negative dielectric anisotropy appears.

Słowa kluczowe

EN

liquid crystal; dual-frequency; addressing; fluorosubstituted esters; isothiocyanato esters

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2009
• Tom: Vol. 17, No. 1
• Strony: 16--19
• Opis fizyczny: Bibliogr. 12 poz.

Twórcy

autor

Ziobro D.

autor

Kula P.

autor

Dziaduszek J.

autor

Filipowicz M.

autor

Dąbrowski R.

autor

Parka J.

autor

Czub J.

autor

Urban S. S.

autor

Wu S. T.

• Institute of Chemistry, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland,

Bibliografia

• [1] X. Liang, Y.Q. Lu, Y.H. Wu, F. Du, H.Y. Wang, and S.T. Wu: Dual-frequency addressed variable optical attenuator with submillisecond response time. Jpn. J. Appl. Phys. 44, 1292-1295, 2005.
• [2] P.D. Brimicombe, S.J. Elston, and E.P. Raynes: A dual frequency addressed polymer stabilized pi-cell liquid crystal device. Liq. Cryst. 34, 641-647, 2007.
• [3] S.S. Zhang, R. Ren, X.M. Li, Q. Li, X.Y. Song, and Q.L. Wei: Synthesis and liquid crystalline properties of novel compounds containing a 3-fluoro-4-cyanophenoxy group. Liq. Cryst. 33, 795-801, 2006.
• [4] M. Hird: Fluorinated liquid crystals - properties and applications. Chem. Soc. Rev. 36, 2070-2095, 2007 and cited references.
• [5] H.T. Nguen: Polymorphism of mesogenic substances containing polar molecules. Part III. Molecular aspects. J. Chim. Phys. 80, 83-98, 1983.
• [6] F. Hardouin, A.M. Levelut, M.F. Achard, and G. Sigaud: Polymorphism of mesogenic substances containing polar molecules. Part I. Physical chemistry and structure. J. Chim. Phys. 80, 53-64, 1983.
• [7] R. Dabrowski and K. Czuprynski: Induced smectic and nematic phases and re-entrant phenomena. Modern Topics in Liquid Crystals, pp. 125-160, edited by A. Buka, Word Scientific Publishing Co., 1997.
• [8] B.J. Ostrowski and M.A. Saidakhmetor: X-ray study of modulated smectic A phase. Mol. Cryst. Liq. Cryst. 192, 19-24, 1990.
• [9] M. Brodzik and R. Dabrowski: Induction of smectic Ad phase in mixtures of polar esters. Mol. Cryst. Liq. Cryst. 260, 361-367, 1995.
• [10] B. Jankiewicz, W. Drzewiński, and R. Dąbrowski: Two and three cyanoesters lateralny substituted with fluorine. 16 CLC Conf. Proc., Stare Jablonki, Poland, 21-28, 2005.
• [11] D. Ziobro, J. Dziaduszek, M. Filipowicz, R. Dabrowski, J. Czub, and S. Urban, Synthesis of fluorosubstituted esters and their dielectric properties. Mol. Cryst. Liq. Cryst. (in preparation, 2008)
• [12] W. Gray, M. Hird, D. Lacey, and K.J. Toyne: The synthesis and transition temperatures of some fluoro-substituted 4-cyanophenyl and 4-cyanobiphenyl-4'-yl 4-pentyl- and 4-butoxybenzoates. Mol. Cryst. Liq. Cryst. 172, 165-189, 1989.