Dielectric response of 1,1-difluorosumanene caused by an in-plane motion
Dielectric response of 1,1-difluorosumanene caused by an in-plane motion
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DOI：
10.1039/d2qm00134a
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发表时间：
2022-04-09
影响因子：
7
通讯作者：
Sakurai, Hidehiro
中科院分区：
文献类型：
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作者：
Li, Minghong;Wu, JianYun;Sakurai, Hidehiro
我们设计并合成了一种新的弯曲π共轭分子1，1-二氟苏曼烯（1），它在未取代苏曼烯的同一个苄基碳上有两个氟原子，沿面内方向产生沿着大的偶极矩。热分析、变温X射线衍射和IR测量表明，在堆叠柱中1的120度面内运动，这不会引起结晶状态的任何相变。实际上，对1的粉末和单晶形式的介电测量表明，介电常数的真实的部分（ε（1））和虚部分（ε（2））都增强到高于类似于360 K，在1 MHz下具有德拜型介电弛豫，证实1经历了由外部电场诱导的钟摆波动。
We have designed and synthesized a new curved pi-conjugated molecule, 1,1-difluorosumanene (1), which possesses two fluorine atoms on the same benzylic carbon of unsubstituted sumanene, producing a large dipole moment along the in-plane direction. Thermal analyses, variable-temperature X-ray diffraction, and IR measurements indicated a 120 degrees in-plane motion of 1 in the stacking columns, which did not cause any phase transition in the crystalline state. Indeed, dielectric measurements on powder and single-crystal forms of 1 showed that both the real (epsilon(1)) and imaginary (epsilon(2)) parts of the dielectric constant were enhanced above similar to 360 K at 1 MHz with a Debye-type dielectric relaxation, confirming that 1 underwent a pendulum fluctuation induced by the external electric field.