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Abstract:

Birefringence in the mesophase of 4-cyano-4′-n-pentylbiphenyl (5CB) was measured directly under a magnetic field (1200 and 2000 gauss) as a function of temperature with field parallel and perpendicular to the optical axis. Electrical dinole moments of 5CB and benzonitrile were calculated with the Mechetti-Barón equations from measurements at three temperatures. Molecular geometries were examined with a semiempirical procedure (AMPAC). The results suqgest that thermal stirring and internal rotations appear to overcome orientational effects of the applied field. © 1989.

Registro:

Documento: Artículo
Título:Liquid crystal birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry.
Autor:López Iqlesias, M.C.; Barón, M.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellon I, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Año:1989
Volumen:44
Número:1
Página de inicio:63
Página de fin:71
DOI: http://dx.doi.org/10.1016/0167-7322(89)80098-4
Título revista:Journal of Molecular Liquids
Título revista abreviado:J Mol Liq
ISSN:01677322
CODEN:JMLID
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01677322_v44_n1_p63_LopezIqlesias

Referencias:

  • - P.G. de Gennes, The Physics of Liquid Crystals. Clarendon Press. Oxford; Chatelain, (1943) Rull. Soc. Fr. Miner. Crist., 66, p. 105
  • Pellet, Chatelain, (1950) Bull. Soc. Fr. Miner. Cryst., 73, p. 154
  • Bunning, Crellin, Faber, The effect of molecular biaxiality on the bulk properties of some nematic liquid crystals (1986) Liquid Crystals, 1 (1), pp. 37-51
  • Takei, Yamaguchi, Osamura, Fuke, Kaya, Electronic spectra and molecular structure of biphenyl and para-substituted biphenyls in a supersonic jet (1989) The Journal of Physical Chemistry, 92, pp. 577-581. , and references therein cited
  • Ferraro, Estudio de la influencia de un campo magnético constante sobre el índice de refracción de un cristal líquido. Trabaios de Laboratorio II (1979) Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires
  • - Liquid Crystals. Data Sheet. BDH Chemicals Ltd. Poole, Great Britain; - The complete description of the temperature control device will be published elsewhere; Dewar, Thiel, (1977) J. Am. Chem. Soc., 99, p. 4899
  • Barón, Vapor-phase dipole moment values from solution measurements (1985) The Journal of Physical Chemistry, 89, pp. 4873-4875
  • Barón, Arévalo, (1928) J. Chem. Ed., 65, (7), pp. 644-645
  • Smith, (1955) Electric Dipole Moments, , Butterworth Scientific Publ, London
  • - Riddick and Burger. Orgenic Solvents. Vol II. Pag. 412-Table 215; Cowley, Partington, (1936) J. Ch. Soc., p. 1192. , 1184-94
  • Muller, Influence of the solvent on dipole-moments (1934) Transactions of the Faraday Society, 30, p. 729

Citas:

---------- APA ----------
López Iqlesias, M.C. & Barón, M. (1989) . Liquid crystal birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry. Journal of Molecular Liquids, 44(1), 63-71.
http://dx.doi.org/10.1016/0167-7322(89)80098-4
---------- CHICAGO ----------
López Iqlesias, M.C., Barón, M. "Liquid crystal birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry." Journal of Molecular Liquids 44, no. 1 (1989) : 63-71.
http://dx.doi.org/10.1016/0167-7322(89)80098-4
---------- MLA ----------
López Iqlesias, M.C., Barón, M. "Liquid crystal birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry." Journal of Molecular Liquids, vol. 44, no. 1, 1989, pp. 63-71.
http://dx.doi.org/10.1016/0167-7322(89)80098-4
---------- VANCOUVER ----------
López Iqlesias, M.C., Barón, M. Liquid crystal birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry. J Mol Liq. 1989;44(1):63-71.
http://dx.doi.org/10.1016/0167-7322(89)80098-4