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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)838-840
Number of pages3
JournalJournal of the Korean Physical Society
Volume72
Issue number7
DOIs
Publication statusPublished - 2018 Apr 1

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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