通过金属有机框架的脊柱迁移进行链接交换
Nader Al Danaf1, Waldemar Schrimpf1, Patrick Hirschle1
1Department of Chemistry and Center for NanoScience, University of Munich, Butenandtstraße 5-13, 81377 Munich, Germany.
Journal of the American Chemical Society
|July 6, 2021
概括
一种称为通过脊柱扩散的新机制允许重的有机连接器进入狭窄的金属有机框架 (MOF). 这一过程使得大型分子能够被纳入MOF中,从而扩大其潜在的应用.
科学领域:
- 材料科学
- 化学学
- 纳米技术
背景情况:
- 金属有机框架 (MOF) 是具有可调节结构的多孔材料.
- 合成后交换 (PSE) 允许在初始合成后对MOF进行修改.
- 由于孔隙大小的限制,将大型功能组纳入MOF具有挑战性.
研究的目的:
- 在狭窄窗口MOF中研究大量有机链接剂的合成后交换 (PSE) 机制.
- 证明将大型寄宿物种纳入具有受限孔径的MOF的可行性.
- 引入和定义"通过骨干扩散"机制.
主要方法:
- 使用光强度和终身成像显微镜观察连接器扩散和缺陷形成.
- 在狭窄窗口的MOF晶体中进行后合成交换 (PSE) 实验.
- 分析缺失链接器缺陷的空间分布,以了解扩散途径.
主要成果:
- 通过一种新的"通过骨干扩散"机制,证明了体积庞大的有机连接物可以穿透狭窄的MOF晶体.
- 观察到缺失链接器缺陷的梯度, 与PSE从晶体表面向内进展相关.
- 成功地将大型功能组纳入以前无法进行此类修改的MOF中.
结论:
- 通过脊柱扩散是修改受限孔径的MOF的一个可行的机制.
- 这种方法扩大了MOF类型,可以容纳催化剂或生物分子等大型客物种.
- 这些发现扩大了MOF在需要复杂客户的领域的应用范围.
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