自修复复杂的螺旋柱是通过动力控制的自组装登德罗化二氧化的自修复复杂螺旋柱
Virgil Percec1, Steven D Hudson, Mihai Peterca
1Roy & Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States. percec@sas.upenn.edu
Journal of the American Chemical Society
|October 5, 2011
概括
登德罗化烯二氧化物分子自组装成螺旋柱. 温度和分子结构控制自我组装过程,影响超分子电子和太阳能电池应用.
科学领域:
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
背景情况:
- 丹德罗化烯3,4:9,10-四碳酸比西米德 (PBI) 自组装成螺旋柱,PBI四重体作为重复单元.
- 自组装过程取决于温度,在热力学或动力学控制下产生不同的柱状相 (2D六边形或3D正方形).
研究的目的:
- 通过 (3,4,5) nG1-3-PBI分子 (n=14-4) 图书馆形成的超分子结构进行合成和结构分析.
- 阐明控制这些PBI衍生物在不同温度下自我组装和重组的复杂动态过程.
主要方法:
- 不同扫描热量计 (DSC)
- 在X射线衍射 (XRD) 中.
- 电子衍射的电子衍射方式
- 固态核磁共振 (NMR) 光谱在可变温度下进行.
主要成果:
- 对于具有n=11-8的PBI衍生品,低温动力自组装过渡到热力学控制.
- 对于n=9和8,正方体柱状数组 (热力学积) 转化为运动积.
- 一个新的热力学产物,一个自我修复的螺旋柱,具有3.5 Å的重复距离,通过动力自组为n=9和8.的3D单临床阵列.
结论:
- 这项研究揭示了斑块化PBIs中复杂的温度依赖的自我组装行为.
- 了解这些动态过程对于设计先进的超分子材料至关重要.
- 这些发现对超分子电子和太阳能电池技术的分子设计有影响.
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