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Abstract:

Birefringence of 4-cyano-4′-n-hexylbiphenyl (6CB) and 4-cyano-4′-n-heptylbyphenyl (7CB) was measured directly under a magnetic field (1200 G and 2000 G) as a function of temperature. Electrical dipole moments were calculated with the Mechetti-Barón equations from measurements at three temperatures. Molecular geometries were examined with a semi-empirical procedure (AMPAC). Differences with previously studied 4-cyano-4′-n-pentylbiphenyl (5CB) were observed. © 1991.

Registro:

Documento: Artículo
Título:Birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry of 6CB and 7CB.
Autor:Iglesias, M.C.L.; Barón, M.
Filiación:Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellon I, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Light - Birefringence; Magnetic Field Effects; Organic Compounds - Molecular Structure; Electric Dipole Moments; Organic Compounds
Año:1991
Volumen:50
Número:C
Página de inicio:107
Página de fin:114
DOI: http://dx.doi.org/10.1016/0167-7322(91)80038-6
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_v50_nC_p107_Iglesias

Referencias:

  • Iglesias, Barón, Liquid crystal birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry. (1989) Journal of Molecular Liquids, 44, pp. 63-71
  • - Liquid crystals. Data sheet. BDH Chemicals Ltd. Poole, Great Britain; 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, Dipole moment values from single-solution measurements (1988) Journal of Chemical Education, 65 (7), pp. 644-645
  • Smith, (1957) Electric Dipole Moments, , Butterworth Sc. Publ, London
  • - P. G. de Gennes, The Physics of Liquid Crystals. Clarendon Press. Oxford; Gray, Moseley, Trends in the nematic?isotropic liquid transition temperatures for the homologous series of 4-n-alkoxy- and 4-n-alkyl-4?-cyanobiphenyls (1976) Journal of the Chemical Society, Perkin Transactions 2, pp. 97-102
  • Lalanne, Lemaire, Rouch, Vaucamps, Proutiere, The even–odd effect in liquid crystals: A collective or intrinsic molecular property (1983) The Journal of Chemical Physics, 73 (4), pp. 1927-1931
  • Haase, Paulus, Pendzealek, (1983) Mol. Cryst. Liq., 100, p. 211

Citas:

---------- APA ----------
Iglesias, M.C.L. & Barón, M. (1991) . Birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry of 6CB and 7CB. Journal of Molecular Liquids, 50(C), 107-114.
http://dx.doi.org/10.1016/0167-7322(91)80038-6
---------- CHICAGO ----------
Iglesias, M.C.L., Barón, M. "Birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry of 6CB and 7CB." Journal of Molecular Liquids 50, no. C (1991) : 107-114.
http://dx.doi.org/10.1016/0167-7322(91)80038-6
---------- MLA ----------
Iglesias, M.C.L., Barón, M. "Birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry of 6CB and 7CB." Journal of Molecular Liquids, vol. 50, no. C, 1991, pp. 107-114.
http://dx.doi.org/10.1016/0167-7322(91)80038-6
---------- VANCOUVER ----------
Iglesias, M.C.L., Barón, M. Birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry of 6CB and 7CB. J Mol Liq. 1991;50(C):107-114.
http://dx.doi.org/10.1016/0167-7322(91)80038-6