PDF/月刊誌論文/code:pg_1104_44 マテリアル インテグレーション 2011年4月号
MATERIALS INTEGRATION 地域と世界に貢献する東北大学多元物質科学研究所(4,5月合併号)

分子性結晶を用いた強誘電材料の開発
■著者
東北大学多元物質科学研究所　 高分子・ハイブリッド材料研究センター　ハイブリッド材料創製分野 芥川 智行

■要約
Artificial molecular rotator has attracted much attention with respect to the development of functional molecular materials. Random motion of molecular rotators-the two-fold flip-flop motion of a rotator unit, for example-causes a rotation of the local structure. Such molecular motion is controllable using an external electric field, which can be utilized as polarization units in ferroelectrics. Novel ferroelectrics based on supramolecular rotator - stator structure in cation - anion salt will open up new horizons in research, because a chemically designable dipole unit enables control of the nature of the ferroelectric transition temperature. m-Fluoroanilinium forms a hydrogen-bonding assembly with dibenzo[18]crown-6, which was introduced as the counter cation of [Ni(dmit)2]- anions (dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate). The supramolecular rotator of m-fluoroanilinium exhibited dipole rotation by the application of an electric field, and the crystal exhibited a ferroelectric - paraelectric transition at 348 K.