Orientational Change of the Trifluoromethyl Group at the Ferroelectric-Antiferroeletric Transition Observed by NMR Spectroscopy

Shohei Yoshida Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Bo Jin Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Yoichi Takanishi Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Ken Ishikawa Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Hideo Takezoe Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Atsuo Fukuda Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Toshihito Nakai Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan; Department of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, 305, Japan

Seiichi Miyajima Department of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, 305, Japan; Institute for Molecular Science, Myodaiji, Okazaki, 444, Japan

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Abstract

The temperature dependence of the order parameter of the -CF₃ group, S_−CF₃, at the chiral part in 4-[(1-trifluoromethylhepthyloxy)carbonyl]phenyl [(4′-octyloxy) biphenyl]-4-carboxylate (TFMHPOBC) has been investigated by NMR spectroscopy. The discontinuous change of S_−CF₃ was observed at the ferroelectricantiferroelectric phase transition. This suggests he importance of the conformation around the chiral center for the appearance of the antiferroelectric phase.

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Orientational Change of the Trifluoromethyl Group at the Ferroelectric-Antiferroeletric Transition Observed by NMR Spectroscopy

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Orientational Change of the Trifluoromethyl Group at the Ferroelectric-Antiferroeletric Transition Observed by NMR Spectroscopy

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