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Inversion of Molecular Chirality Associated with Ferroelectric Switching in a High-Temperature Two-Dimensional Perovskite Ferroelectric
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-02-24 , DOI: 10.1021/jacs.3c00634 Wen-Feng Deng 1 , Yu-Xia Li 1 , Yan-Xin Zhao 1 , Jie-Sheng Hu 1 , Zi-Shuo Yao 1 , Jun Tao 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-02-24 , DOI: 10.1021/jacs.3c00634 Wen-Feng Deng 1 , Yu-Xia Li 1 , Yan-Xin Zhao 1 , Jie-Sheng Hu 1 , Zi-Shuo Yao 1 , Jun Tao 1
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Controlling molecular chirality by external stimuli is of great significance in both fundamental research and technological applications. Herein, we report a high-temperature (384 K) molecular ferroelectric of a Cu(II) complex whose spontaneous polarization can be switched associated with flipping of molecular chirality. In this two-dimensional perovskite structure, the inorganic layer is separated by (NH3(CH2)2SS(CH2)2NH3)2+ organic cations skewed in a chiral conformation (P- or M-helicity in an individual crystal). As the stereodynamic disulfide bridge determines the molecular dipole moment along the polar axis, the chiral organic cation can be converted to its enantiomer as a consequence of an electric field-induced shift of the S–S moiety relative to its screw axis during the ferroelectric switching. The variation of the molecular chirality is examined with single-crystal X-ray diffraction and circular dichroism spectra. The simultaneous switching of molecular chirality and spontaneous polarization in this perovskite ferroelectric may lead to novel chiral electronic phenomena.
中文翻译：
高温二维钙钛矿铁电体中与铁电开关相关的分子手性反转
通过外部刺激控制分子手性在基础研究和技术应用中都具有重要意义。在此，我们报告了 Cu(II) 复合物的高温 (384 K) 分子铁电体，其自发极化可以随着分子手性的翻转而切换。在这种二维钙钛矿结构中，无机层被 (NH 3 (CH 2 ) 2 SS(CH 2 ) 2 NH 3 ) 2+有机阳离子以手性构象（P - 或M）分隔开-单个晶体中的螺旋性）。由于立体动力学二硫键决定了沿极轴的分子偶极矩，因此在铁电转换过程中，由于电场引起的 S-S 部分相对于其螺旋轴的位移，手性有机阳离子可以转化为其对映异构体. 用单晶 X 射线衍射和圆二色谱检查分子手性的变化。这种钙钛矿铁电体中分子手性和自发极化的同时切换可能会导致新的手性电子现象。
更新日期：2023-02-24
中文翻译：
高温二维钙钛矿铁电体中与铁电开关相关的分子手性反转
通过外部刺激控制分子手性在基础研究和技术应用中都具有重要意义。在此，我们报告了 Cu(II) 复合物的高温 (384 K) 分子铁电体，其自发极化可以随着分子手性的翻转而切换。在这种二维钙钛矿结构中，无机层被 (NH 3 (CH 2 ) 2 SS(CH 2 ) 2 NH 3 ) 2+有机阳离子以手性构象（P - 或M）分隔开-单个晶体中的螺旋性）。由于立体动力学二硫键决定了沿极轴的分子偶极矩，因此在铁电转换过程中，由于电场引起的 S-S 部分相对于其螺旋轴的位移，手性有机阳离子可以转化为其对映异构体. 用单晶 X 射线衍射和圆二色谱检查分子手性的变化。这种钙钛矿铁电体中分子手性和自发极化的同时切换可能会导致新的手性电子现象。
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