Chiral hydrazone photoswitch features are its high thermal stability and negative photochromy, making it desirable in the fabrication of thermally stable optical device. However, chiral hydrazones capable of reversibly inversing chirality is scarcely reported. Herein, a series of new chiral hydrazone switches, HI-1, HI-2 and HI-3, were designed and synthesized. Due to the photoinduced configuration changes, the newly synthesized hydrazone photoswitch presents a surprising chirality inversion upon light stimulation. Photoisomerization of light-driven hydrazone switch molecules was investigated by nuclear magnetic resonance (NMR) spectra and Raman spectroscopy. The effect of the intramolecular hydrogen bond on photoresponsiveness was analyzed. By incorporating the photoswitch into a liquid crystal (LC) host, light-driven cholesteric liquid crystals (CLCs) with handedness invertibility, a feasible photonic bandgap tunability, and superior thermal stability were achieved. In addition, according to the optical-driven thermal stability of the hydrazone switches, the fine regulation of light-driven CLC materials with multistage photo stationary states was realized, and the application of CLC materials in erasable and rewritable display panels was also demonstrated.

中文翻译：

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通过新型热稳定光驱动手性腙开关实现自组织螺旋上部结构的动态旋向反转


手性腙光开关的特点是其高热稳定性和负光致变色，使其成为制造热稳定光学器件的理想选择。然而，能够可逆反转手性的手性腙很少报道。在此，设计并合成了一系列新的手性腙开关 HI-1、HI-2 和 HI-3。由于光诱导构型的变化，新合成的 hydrazone 光开关在光刺激下呈现令人惊讶的手性反转。通过核磁共振 （NMR） 光谱和拉曼光谱研究了光驱动的腙开关分子的光异构化。分析了分子内氢键对光响应性的影响。通过将光开关集成到液晶 （LC） 主体中，实现了具有旋性可逆性、可行的光子带隙可调性和优异的热稳定性的光驱动胆甾液晶 （CLC）。此外，根据 hydrazone 开关的光学驱动热稳定性，实现了对具有多级光静止状态的光驱动 CLC 材料的精细调控，并展示了 CLC 材料在可擦除和可重写显示面板中的应用。