在金属有机框架中的多个动态元素的固态机器.
Jacopo Perego1, Andrea Daolio1, Charl X Bezuidenhout1
1Department of Materials Science, University of Milano Bicocca, Milan, Italy.
Angewandte Chemie (International ed. in English)
|January 18, 2024
概括
这项研究设计了一种灵活的金属有机框架,以创建固态分子机器. 化学刺激,如蒸汽,触发协调的运动,增强双cyclopentane的移动性和旋转机动力学.
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:
- 金属有机框架 (MOF) 提供可调节的多孔架构.
- 在固体中设计分子机器需要精确控制运动.
- 灵活的MOF可以托管和操纵移动客分子.
研究的目的:
- 设计和研究一种灵活的,相互透的MOF,能够协调分子运动.
- 在外部刺激下探索客分子和框架组件的动态.
- 在基于MOF的分子机器中建立结构动力学关系.
主要方法:
- 一个双重相互透的支柱式MOF的合成.
- 使用多核固态NMR,同步辐射XRD和气体吸附进行表征.
- 计算建模以阐明转子结构相互作用.
- 使用蒸汽和压缩CO2的动力学刺激.
主要成果:
- MOF精确地组织了双cyclopentane (BCP),pyridyl旋转器和一个基组.
- 化学刺激诱导互惠子网络滑动,改变通道大小和动态.
- 吸附触发了类似活塞的运动,增加了BCP的可移动性,以在低温下实现超快速的运动.
- 基旋转器表现出差异动力学,而基组促进了式运动.
- 压缩 CO2 调节 BCP 动态,根据工地占用情况.
结论:
- 工程MOF作为一个复杂的分子机器在固态状态.
- 框架灵活性与观察到的旋转动力学密切相关.
- 这项工作展示了基于协调分子运动的动态功能材料设计的途径.
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