Supramolecular bola-like ferroelectric: 4-methoxyanilinium tetrafluoroborate-18-crown-6 |
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Authors: | Fu Da-Wei Zhang Wen Cai Hong-Ling Zhang Yi Ge Jia-Zhen Xiong Ren-Gen Huang Songping D |
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Institution: | Ordered Matter Science Research Center, Southeast University, Nanjing 211189, China. |
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Abstract: | Molecular motion is one of the structural foundations for the development of functional molecular materials such as artificial motors and molecular ferroelectrics. Herein, we show that pendulum-like motion of the terminal group of a molecule causes a ferroelectric phase transition. Complex 4-methoxyanilinium tetrafluoroborate-18-crown-6 (C(7)H(10)NO(18-crown-6)](+)BF(4)](-), 1) shows a second-order ferroelectric phase transition at 127 K, together with an abrupt dielectric anomaly, Debye-type relaxation behavior, and the symmetry breaking confirmed by temperature dependence of second harmonic generation effect. The origin of the polarization is due to the order-disorder transition of the pendulum-like motions of the terminal para-methyl group of the 4-methoxyanilinium guest cation; that is, the freezing of pendulum motion at low temperature forces significant orientational motions of the guest molecules and thus induces the formation of the ferroelectric phase. The supramolecular bola-like ferroelectric is distinct from the precedent ferroelectrics and will open a new avenue for the design of polar functional materials. |
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