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首页> 外文期刊>Molecular Crystals and Liquid Crystals Science and Technology, Section A. Molecular Crystals and Liquid Crystals >New Chiral-Photochromic Dopant with Variable Helical Twisting Power and its use in Photosensitive Cholesteric Materials
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New Chiral-Photochromic Dopant with Variable Helical Twisting Power and its use in Photosensitive Cholesteric Materials

机译：新型螺旋扭曲力手性光致变色掺杂剂及其在光敏胆甾材料中的应用

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摘要

A new photosensitive chiral dopant based on cinnamic acid and isosorbide was synthesised. UV light action leads to E-Z photoisomerization of the dopant about C=C double bond of cinnamoyl fragment. Mixtures of the dopant with nematic and cholestric polymers were studied. It was shown, that planary-oriented films of mixtures possess a selective light reflection in ultraviolet, visible and infrared regions of spectrum depending on the dopant concentration. The helical twisting power of the chiral dopant was calculated. UV light action on mixture films leads to a shift of selective light reflection peak to the long wavelength region of spectrum, which is explained by photoisomerization and decrease of the helical twisting power of the dopant. Kinetics of the process of photoinduced untwisting of the cholesteric helix was studied. Advantages of the use of the synthesised dopant and of mixtures based on it were demonstrated in comparison to earlier studied chiral-photochromic materials optical data recording and storage.
机译：合成了一种基于肉桂酸和异山梨醇的新型光敏手性掺杂剂。紫外光作用导致掺杂剂的E-Z光异构化，肉桂基片段的C = C双键。研究了掺杂剂与向列型和胆甾型聚合物的混合物。结果表明，取决于掺杂剂的浓度，混合物的平面取向膜在光谱的紫外，可见和红外区域具有选择性的光反射。计算了手性掺杂剂的螺旋扭曲力。紫外线对混合膜的作用导致选择性光反射峰移动到光谱的长波长区域，这可以通过光异构化和降低掺杂剂的螺旋扭曲力来解释。研究了胆甾醇螺旋的光诱导解捻过程的动力学。与先前研究的手性光致变色材料光学数据记录和存储相比，已证明了使用合成的掺杂剂和基于其的混合物的优势。

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