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Magnetic alignment study of rare-earth-containing liquid crystals

(2007) JOURNAL OF PHYSICAL CHEMISTRY B. 111(50). p.13881-13885
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Abstract
The liquid-crystalline rare-earth complexes of the type [Ln(LH)(3)(DOS)(3)]-where Ln is Tb, Dy, Ho, Er, Tm, or Yb; LH is the Schiff base N-octadecyl-4-tetradecyloxysalicylaldimine; and DOS is dodecylsulfate-exhibit a smectic A phase. Because of the presence of rare-earth ions with a large magnetic anisotropy, the smectic A phase of these liquid crystals can be easier aligned in an external magnetic field than smectic A phases of conventional liquid crystals. The magnetic anisotropy of the [Ln(LH)3(DOS)31 complexes was determined by measurement of the temperature-dependence of the magnetic susceptibility using a Faraday balance. The highest value for the magnetic anisotropy was found for the dysprosium(III) complex. The magnetic alignment of these liquid crystals was studied by time-resolved synchrotron small-angle X-ray scattering experiments. Depending on the sign of the magnetic anisotropy, the director of the liquid-crystalline molecules was aligned parallel or perpendicular to the magnetic field lines. A positive value of the magnetic anisotropy (and parallel alignment) was found for the thulium(III) and the ytterbium(III) complexes, whereas a negative value of the magnetic anisotropy (and perpendicular alignment) was observed for the terbium(III) and dysprosium(III) complexes.
Keywords
FIELD-INDUCED ALIGNMENT, LANTHANIDE-CONTAINING METALLOMESOGENS, SCHIFFS BASES, X-RAY, ANISOTROPY, COMPLEXES, SUSCEPTIBILITY, ORIENTATION, BEHAVIOR, MESOMORPHISM

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Chicago
Galyametdinov, Yury G, Wolfgang Haase, Bart Goderis, Dries Moors, Kris Driesen, Rik Van Deun, and Koen Binnemans. 2007. “Magnetic Alignment Study of Rare-earth-containing Liquid Crystals.” Journal of Physical Chemistry B 111 (50): 13881–13885.
APA
Galyametdinov, Y. G., Haase, W., Goderis, B., Moors, D., Driesen, K., Van Deun, R., & Binnemans, K. (2007). Magnetic alignment study of rare-earth-containing liquid crystals. JOURNAL OF PHYSICAL CHEMISTRY B, 111(50), 13881–13885.
Vancouver
1.
Galyametdinov YG, Haase W, Goderis B, Moors D, Driesen K, Van Deun R, et al. Magnetic alignment study of rare-earth-containing liquid crystals. JOURNAL OF PHYSICAL CHEMISTRY B. 2007;111(50):13881–5.
MLA
Galyametdinov, Yury G, Wolfgang Haase, Bart Goderis, et al. “Magnetic Alignment Study of Rare-earth-containing Liquid Crystals.” JOURNAL OF PHYSICAL CHEMISTRY B 111.50 (2007): 13881–13885. Print.
@article{1190106,
  abstract     = {The liquid-crystalline rare-earth complexes of the type [Ln(LH)(3)(DOS)(3)]-where Ln is Tb, Dy, Ho, Er, Tm, or Yb; LH is the Schiff base N-octadecyl-4-tetradecyloxysalicylaldimine; and DOS is dodecylsulfate-exhibit a smectic A phase. Because of the presence of rare-earth ions with a large magnetic anisotropy, the smectic A phase of these liquid crystals can be easier aligned in an external magnetic field than smectic A phases of conventional liquid crystals. The magnetic anisotropy of the [Ln(LH)3(DOS)31 complexes was determined by measurement of the temperature-dependence of the magnetic susceptibility using a Faraday balance. The highest value for the magnetic anisotropy was found for the dysprosium(III) complex. The magnetic alignment of these liquid crystals was studied by time-resolved synchrotron small-angle X-ray scattering experiments. Depending on the sign of the magnetic anisotropy, the director of the liquid-crystalline molecules was aligned parallel or perpendicular to the magnetic field lines. A positive value of the magnetic anisotropy (and parallel alignment) was found for the thulium(III) and the ytterbium(III) complexes, whereas a negative value of the magnetic anisotropy (and perpendicular alignment) was observed for the terbium(III) and dysprosium(III) complexes.},
  author       = {Galyametdinov, Yury G and Haase, Wolfgang and Goderis, Bart and Moors, Dries and Driesen, Kris and Van Deun, Rik and Binnemans, Koen},
  issn         = {1520-6106},
  journal      = {JOURNAL OF PHYSICAL CHEMISTRY B},
  keyword      = {FIELD-INDUCED ALIGNMENT,LANTHANIDE-CONTAINING METALLOMESOGENS,SCHIFFS BASES,X-RAY,ANISOTROPY,COMPLEXES,SUSCEPTIBILITY,ORIENTATION,BEHAVIOR,MESOMORPHISM},
  language     = {eng},
  number       = {50},
  pages        = {13881--13885},
  title        = {Magnetic alignment study of rare-earth-containing liquid crystals},
  url          = {http://dx.doi.org/10.1021/jp0771724},
  volume       = {111},
  year         = {2007},
}

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