通过形状移动的多孔材料对结构和客体吸收进行化学控制
Alexandros P Katsoulidis1, Dmytro Antypov1, George F S Whitehead1
1Department of Chemistry, University of Liverpool, Liverpool, UK.
Nature
|January 11, 2019
概括
灵活的金属有机框架 (MOF) 可以通过旋转链接器采用多个晶体结构. 这种形状变化能够控制客体吸收,使不活跃的MOF转化为活跃的MOF.
科学领域:
- 材料科学
- 化学学
- 晶体学
背景情况:
- 金属有机框架 (MOF) 是多孔材料,在吸附和催化中具有应用.
- 刚性MOF具有单一的能量最小值,与导航多个转移稳定的结构的蛋白质不同.
- 灵活的MOF提供了动态结构变化的潜力,类似于蛋白质的结构灵活性.
研究的目的:
- 通过连接器的形状变化,证明柔性MOF可以表现出多个晶体结构.
- 通过诱导MOF链接器的结构变化来研究客体吸收的化学控制.
- 为灵活的MOF揭示一个多最小的构造能量格局.
主要方法:
- 合成了一种灵活的MOF,具有可旋转的链.
- 使用X射线衍射识别了九种不同的晶体结构.
- 由形变化的化学诱导引发的小分子客体吸收.
主要成果:
- 在链体中对共价键的旋转产生了九种不同的晶体结构.
- MOF表现出具有多个结构最小值的结构性能量景观.
- 化学触发的形变化调节了客体吸附活动.
结论:
- 灵活的MOF可以拥有多个超稳定的结构,形成一个结构化的能量格局.
- 连接器形状的化学控制允许调整孔隙几何和表面化学.
- 这种方法为设计响应式开放框架材料提供了新的途径.
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