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Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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Blue-hazard-free Candlelight OLED

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赫萨基斯 (hexakis ((4-iodophenyl) -peri-hexabenzocoronene) - - 一种用于高排序的光盘液晶材料的多功能构建块.

Jishan Wu¹, Mark D Watson, Li Zhang

¹Max-Planck Institute for Polymer Research, Ackermannweg 10, D-55128, Mainz, Germany.

Journal of the American Chemical Society

|January 8, 2004

概括

研究人员合成了一种新的液晶构建块,Hexakis (4-iodophenyl) -peri-hexabenzocoronene,使得能够创建具有独特螺旋结构的高度有序的柱状液晶分子.

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科学领域:

材料科学材料科学材料科学
有机化学有机化学
超分子化学超分子化学

背景情况:

六enzocoronenes (HBCs) 以它们的液晶性质而闻名.
血清细胞的功能化是调整它们的自我组装和中相行为的关键.

研究的目的:

为了合成一种基于hexabenzocoronene的新型,可实现功能化的mesogenic构建块.
创建和表征新的高度有序的柱状液晶分子,从这个构建块中衍生出来.

主要方法:

合理的多步合成Hexakis (4-iodophenyl) -peri-hexabenzocoronene. 这是一个非常简单的方法.
哈吉哈拉-索诺加希拉合用于功能化.
不同扫描热度计 (DSC),极化光学显微镜 (POM) 和广角X射线衍射 (WAXD) 用于热热态行为分析.
原子力显微镜 (AFM) 用于薄膜形态研究.

主要成果:

在高产量的Hexakis (4-iodophenyl) -peri-hexabenzocoronene的成功合成.
与基替代HBC相比,形成高度排序的柱状液晶分子 (14a-c) 具有增强的排序.
观测三维有序的超结构,包括螺旋柱状中相.
AFM揭示了自组装的柱状聚合物和纳米丝带.

结论:

新型基功能化HBC是先进液晶的多功能构建块.
刚性棒侧组促进了增强的柱体内相互作用和排序.
这些材料表现出独特的自我组装行为,形成有序的纳米结构,与先进材料应用相关.