35Cl NQR of an organic ferroelectric phenazine chloranilic acid co-crystal

Tetsuo Asaji, Kazuma Gotoh, Jun Watanabe

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A ferroelectric transition of phenazine (Phz) chloranilic acid (H2ca) co-crystal was studied by 35Cl nuclear quadrupole resonance (NQR). The single NQR line observed at 36.689 MHz at 295 K, split into a doublet below the ferroelectric transition temperature Tc=253 K in accord with the inversion-symmetry breaking at the H2ca molecular center in the crystal. The continuous variation of the splitting-width through Tc suggests a second-order nature of this phase transition. The NQR frequency is consistent with the crystal structure in which the two acid hydrogen atoms of H2ca remain as attached to the quinone molecules. The spin-lattice relaxation time T1 showed a decrease with decreasing temperature in the ferroelectric phase. This suggests the existence of a fast motion of nearby atomic group, which is a cause of electric field gradient fluctuation.

Original languageEnglish
Pages (from-to)89-92
Number of pages4
JournalJournal of Molecular Structure
Volume791
Issue number1-3
DOIs
Publication statusPublished - Jun 19 2006

Fingerprint

Nuclear quadrupole resonance
nuclear quadrupole resonance
Transition Temperature
Phase Transition
Ferroelectric materials
Hydrogen
Crystals
acids
Temperature
Acids
crystals
Spin-lattice relaxation
quinones
resonance lines
spin-lattice relaxation
Relaxation time
Superconducting transition temperature
hydrogen atoms
broken symmetry
Crystal structure

Keywords

  • Ferroelectrics
  • Nuclear quadrupole resonance
  • Organic crystals
  • Phase transition

ASJC Scopus subject areas

  • Structural Biology
  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)

Cite this

35Cl NQR of an organic ferroelectric phenazine chloranilic acid co-crystal. / Asaji, Tetsuo; Gotoh, Kazuma; Watanabe, Jun.

In: Journal of Molecular Structure, Vol. 791, No. 1-3, 19.06.2006, p. 89-92.

Research output: Contribution to journalArticle

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N2 - A ferroelectric transition of phenazine (Phz) chloranilic acid (H2ca) co-crystal was studied by 35Cl nuclear quadrupole resonance (NQR). The single NQR line observed at 36.689 MHz at 295 K, split into a doublet below the ferroelectric transition temperature Tc=253 K in accord with the inversion-symmetry breaking at the H2ca molecular center in the crystal. The continuous variation of the splitting-width through Tc suggests a second-order nature of this phase transition. The NQR frequency is consistent with the crystal structure in which the two acid hydrogen atoms of H2ca remain as attached to the quinone molecules. The spin-lattice relaxation time T1 showed a decrease with decreasing temperature in the ferroelectric phase. This suggests the existence of a fast motion of nearby atomic group, which is a cause of electric field gradient fluctuation.

AB - A ferroelectric transition of phenazine (Phz) chloranilic acid (H2ca) co-crystal was studied by 35Cl nuclear quadrupole resonance (NQR). The single NQR line observed at 36.689 MHz at 295 K, split into a doublet below the ferroelectric transition temperature Tc=253 K in accord with the inversion-symmetry breaking at the H2ca molecular center in the crystal. The continuous variation of the splitting-width through Tc suggests a second-order nature of this phase transition. The NQR frequency is consistent with the crystal structure in which the two acid hydrogen atoms of H2ca remain as attached to the quinone molecules. The spin-lattice relaxation time T1 showed a decrease with decreasing temperature in the ferroelectric phase. This suggests the existence of a fast motion of nearby atomic group, which is a cause of electric field gradient fluctuation.

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