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基于包含化合物的方法对数组的人工二极分子旋转器. 一个表面包含的包容性
Lukáš Kobr1, Ke Zhao, Yongqiang Shen
1Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA.
Journal of the American Chemical Society
|June 2, 2012
概括
研究人员使用宿主-客人系统创建了有序的分子旋转器阵列. 这种方法可以控制旋转器的位置,影响它们的旋转动力学和能量障碍,用于分子机械的潜在应用.
科学领域:
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
- 纳米技术 纳米技术
背景情况:
- 有序的分子旋转器阵列对于开发分子机器和先进材料至关重要.
- 在宿主结构中控制分子旋转器的精确位置和动态是一个重大挑战.
- 三 (o-二氧化) 环三 (TPP) 提供了一个宿主框架,可以在定义的安排中容纳客分子.
研究的目的:
- 开发一种用于创建双极分子旋转器正规三角阵列的方法.
- 为了研究主机-客机相互作用对分子旋转器的旋转动态的影响.
- 描述涉及分子旋转器的表面包含化合物的形成和性质.
主要方法:
- 一个特定的二极旋转器的合成:1-n-hexadecyl-12-(2,3-dichlorophenyl) -p-dicarba-closo-dodecaborane.
- 宿主-客体复杂化使用tris(o-phenylenedioxy) 循环三 (TPP) 作为宿主.
- 描述技术包括差异扫描热度计 (DSC),固态核磁共振 (NMR) 光谱和粉末X射线衍射 (PXRD).
- 介电光谱测量以确定旋转障碍.
主要成果:
- 成功地将二极旋转器插入TPP通道,形成一个表面包含化合物.
- 通过修改旋转轴的拦截器来证明对旋转器位置 (散装与表面) 的控制.
- 确定了从1.2到9kcal/mol的旋转障碍,这取决于旋转器插入和表面相互作用的程度.
- 旋转器与主体表面相互作用的证据,影响它们的旋转自由.
结论:
- 使用TPP的宿主-客人方法可以形成有序的分子旋转器阵列.
- 可以形成表面纳入化合物,提供一种控制旋转器动态的手段.
- 旋转屏障对旋转器的特定插入深度和表面相互作用敏感.
- 这一策略为设计具有可调节性质的功能分子材料提供了一条途径.
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