Chemical Design of Organic Ferroelectrics Using Dynamics of Alkylamide Chains
Chemical Design of Organic Ferroelectrics Using Dynamics of Alkylamide Chains
复制标题
利用烷基酰胺链动力学进行有机铁电体的化学设计
DOI：
10.1039/d2cc04120k
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Tomoyuki Akutagawa
中科院分区：
文献类型：
--
作者：
Takashi Takeda;Tomoyuki Akutagawa
多肽链是通过分子间酰胺型N-H⋯O氢键形成蛋白质二级结构的重要结构单元。相比之下，烷基酰胺链（–CONHCnH2n+1）是一种有趣的结构单元，其中具有偶极矩的酰胺基团和具有高构象自由度的烷基链共存，已被用于形成液晶、凝胶和超分子聚合物等特征性分子组装结构。基于分子间 N-H⋯O 氢键相互作用的一维链形成这些分子组装体。在液晶中，观察到烷基酰胺取代的苯衍生物的电场-极化磁滞曲线。基于铁电性起源的烷基酰胺链与功能性π电子骨架相结合的分子设计，使铁电性与发光、高热稳定性、光响应和电流开关特性共存，并制备多功能分子材料。手性烷基酰胺链的引入还可有效控制低能耗存储器件的单向偶极子反转和低矫顽电场。分子组装体中的烷基酰胺链可用于开发和控制有机铁电体的物理性质，实现极性酰胺基团的旋转动力学以及液晶和固态中烷基链的熔化。
The polypeptide chain is an important structural unit that forms the secondary structure of proteins via intermolecular amide-type N–H⋯O hydrogen bonds. In contrast, alkylamide chains (–CONHCnH2n+1) are interesting structural units in which an amide group with a dipole moment and an alkyl chain with high conformational freedom coexist, which have been used to form characteristic molecular assembly structures such as liquid crystals, gels, and supramolecular polymers. One-dimensional chains based on intermolecular N–H⋯O hydrogen-bonding interaction form these molecular assemblies. In the liquid crystal, an electric field – polarization hysteresis curve was observed for alkylamide-substituted benzene derivatives. A molecular design based on the combination of the alkylamide chain, which is the origin of ferroelectricity, and the functional π-electron framework enables the coexistence of ferroelectricity with luminescence, high thermal stability, photoresponse, and current switching properties, and the fabrication of multifunctional molecular materials. The introduction of chiral alkylamide chains is also effective in controlling unidirectional dipole inversion and low coercive electric fields for low-energy-consumption memory devices. Alkylamide chains in molecular assemblies are useful for the development and control of the physical properties of organic ferroelectrics that realize the rotational dynamics of polar amide groups coupled with the melting of alkyl chains in the liquid crystal and solid states.