用于可逆光调节相调节的Calamitic液晶,基于阿里亚兹皮拉 (arylazopyrazole) 光开关
Hoàn Quân Trân1, Shinichiro Kawano2, Rebecca E Thielemann1
1Organisch-Chemisches Institut and Center for Soft Nanoscience, Universität Münster, Correnstrasse 36, 48149, Münster, Germany.
Chemistry (Weinheim an der Bergstrasse, Germany)
|November 9, 2023
概括
带有阿里拉佐皮拉醇光开关的光色液晶表现出对光响应的相变. 这些材料为先进的光学设备应用提供了精确的时空控制.
科学领域:
- 材料科学 材料科学 材料科学
- 有机化学 有机化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 响应性液晶对于各种技术应用至关重要.
- 光色液晶在相位过渡上提供了出色的时空控制.
- 最近,由于其光物理性质,阿里拉佐皮拉 (arylazopyrazole) 光开关引起了人们的兴趣.
研究的目的:
- 设计和合成新的灾难性对光敏感的半导体.
- 为了研究这些中原体的液晶性行为和光物理性质.
- 探索它们在商业液晶中作为剂的应用,用于光控制相位过渡.
主要方法:
- 不同扫描热量计 (DSC)
- 牧场发生率X射线衍射 (GIXD)
- 极化光学显微镜 (POM) 是一种光学显微镜.
- 紫外线对紫外线的光谱学.
- 核磁共振 (NMR) 分析分析
主要成果:
- 基于阿里拉佐皮拉 (arylazopyrazole) 光开关的合成中位素表现出液晶状的行为.
- 在溶液和薄膜中证实了出色的光物理性能.
- 在原始化合物中证明了可逆光诱导相变.
- 与5CB一起组装的系统显示了对环境条件的过渡温度降低.
- 在不同波长的辐射下,通过辐射实现了可逆的液晶到同otropic 的相位过渡.
结论:
- 基于阿里亚lazopyrazole的中原体是有效的响应光的液晶.
- 这些材料能够对相位过渡进行精确的时空控制.
- 联合组装的系统为开发新型光学设备提供了潜力.
相关概念视频
01:26Photochemical Electrocyclic Reactions: Stereochemistry
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.