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通过调节模块刚度来调节柔性晶体的刺激诱导动态行为
Han Fang1, Xiao-Yi Liu2, Hao-Jing Ding2
1School of Materials Science and Engineering, National Institute for Advanced Materials, Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300350, China.
Journal of the American Chemical Society
|May 10, 2024
概括
研究人员通过改变连接器的刚性来设计柔性金属有机框架 (MOF). 一种MOF,Flex-Cd-MOF-2a,表现出优异的气体诱导动态行为,并将微观灵活性与宏观弹性联系在一起.
科学领域:
- 材料科学
- 晶体学
- 超分子化学
背景情况:
- 灵活的多孔晶体,如金属有机框架 (MOF),通过将动态行为纳入周期结构来创建.
- 通过分子设计控制这些框架的集体动态对于实现刺激诱导的反应至关重要.
研究的目的:
- 构建两个具有不同连接器刚性的同结构柔性MOF,以调查它们的动态行为.
- 了解连接器结构的微妙变化如何影响框架灵活性和气体吸附特性.
主要方法:
- 使用具有不同C-C键特性 (单键与双键) 的二极管柱链接器合成两个同结构MOF.
- 在移除客分子时研究了单晶到单晶的转化.
- 使用气体吸附等热体 (C3H6/C3H8) 和现场粉末X射线衍射 (PXRD) 来分析动态行为.
- 用分子建模来研究吸附机制,并将微观灵活性与宏观弹性相关联.
主要成果:
- 两种MOF,Flex-Cd-MOF-1a和Flex-Cd-MOF-2a已成功合成,表现出由链接器cis-trans形态变化驱动的可逆单晶变化.
- 与Flex- Cd- MOF-1a相比,Flex- Cd- MOF-2a显著增强了气体诱导的动态行为.
- 在Flex- Cd- MOF-2的宏观弹性和微观弹性之间观察到直接的相关性.
结论:
- 在MOF中变化的链接刚性是调整其动态反应和气体吸附性能的有效策略.
- Flex-Cd-MOF-2a作为具有理想化学机械功能的MOF的模型.
- 这项研究提供了对MOF灵活性的基本见解,为设计先进的功能材料铺平了道路.
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