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Journal of the Korean Physical Society

, Volume 72, Issue 7, pp 838–840 | Cite as

1H Nuclear Magnetic Resonance Study of an Incommensurate-Commensurate Phase Transition in a Dimesogenic Liquid Crystal

  • Kyung Oh Kim
  • Dong Min Choi
  • Cheol Eui Lee
  • Jung-Il Jin
Article
  • 21 Downloads

Abstract

1H nuclear magnetic resonance (NMR) was employed in order to probe an incommensuratecommensurate phase transition in a dimesogenic liquid crystal, N-[4-(6-cholesteryloxycarbonyl) pentyloxy]-4-n-butylazobenzene (KI5A). The recrystallization and the isotropic phase transitions exhibited a discontinuous first-order nature in the 1H NMR spin-lattice (T1) and in the spin-spin relaxation time (T2E) measurements, and an incommensurate smectic A (SAinc) to commensurate helical smectic C (S* C ) liquid crystalline phase transition was marked by a discontinuity in the NMR line splitting representing the orientational order. Furthermore, T1 and T2E showed distinct temperature dependencies in the SAinc phase and in the S* C phase.

Keywords

Dimesogenic liquid crystal 1H nuclear magnetic resonance Commensurate-incommensurate phase transition 

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Copyright information

© The Korean Physical Society 2018

Authors and Affiliations

  • Kyung Oh Kim
    • 1
  • Dong Min Choi
    • 1
  • Cheol Eui Lee
    • 1
  • Jung-Il Jin
    • 2
  1. 1.Department of PhysicsKorea UniversitySeoulKorea
  2. 2.Department of ChemistryKorea UniversitySeoulKorea

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