Electric-field-induced transition between ferro- and antiferroelectric ground states observed in the B7 phase of a bent-shaped molecule with alkylthio tails
作者:Seng Kue Lee、Xiaodong Li、Sungmin Kang、Masatoshi Tokita、Junji Watanabe
DOI:10.1039/b927280a
日期:——
We prepared a new bent-shaped molecule, in which dodecylthio tails and typical Schiff-based side wings are substituted on a conventional phenyl central core. This molecule forms the B7 phase in a temperature region from 117 to 142 °C, which shows characteristic banana leaf and circular domain textures. On application of an electric field, the B7 phase is easily transformed to the B2 phase with two different ground states, depending on the temperature. In the higher temperature region, the B2 phase possesses a homochiral ferroelectric (SmCSPF) ground state, whereas the lower temperature B2 phase has a homochiral antiferroelectric (SmCAPA) ground state. These two states transformed into each other reversibly at 124 °C under the applied field, while they are stable over the mesophase temperature on the field-off state.
我们制备了一种新的弯曲形分子,其中十二烷硫基尾部和典型的席夫基侧翼被取代在传统的苯基中心核上。这种分子在 117 至 142 °C 的温度区域内形成了 B7 相,显示出特有的蕉叶和圆形畴纹理。在施加电场时,B7 相很容易转化为 B2 相,根据温度的不同,B2 相有两种不同的基态。在温度较高的区域,B2 相具有同轴铁电(SmCSPF)基态,而温度较低的 B2 相具有同轴反铁电(SmCAPA)基态。这两种状态在 124 ℃ 的外加磁场下可逆地相互转化,而在介相温度以上的磁场关闭状态下则保持稳定。