在二维共价有机框架中开启和关闭层间相关性和孔隙性
Torben Sick1,2, Julian M Rotter1, Stephan Reuter1
1Department of Chemistry and Center for NanoScience (CeNS) , University of Munich (LMU) , Butenandtstrasse 5-13 , 81377 Munich , Germany.
Journal of the American Chemical Society
|June 29, 2019
概括
二维共价有机框架 (2D COF) 可以在多孔和无孔状态之间可逆切换. 超临界二氧化碳 (scCO2) 激活恢复它们的晶体结构,使其可用于分子选等应用的可控多孔性.
科学领域:
- 材料科学
- 纳米技术
- 超分子化学
背景情况:
- 二维共价有机框架 (2D COF) 具有可取的特性,如孔隙性,热稳定性和可调节的孔隙环境.
- 这些特性使得2DCOF在基于选择性宿主-客互动的分子选应用中具有前景.
研究的目的:
- 设计和研究能够在晶体,多孔和无孔状态之间进行动态,可逆切换的二维COF结构.
- 探索化学结构对基于 imine 的 2D COF 的刺激反应行为的影响.
主要方法:
- 使用各种线性二化物构建块,对一系列二维二胺COF (TAPB-COF) 的系统合成和结构性表征.
- 将COF暴露在外部刺激 (溶剂,溶剂蒸汽) 中以诱导结构变化.
- 使用超临界二氧化碳 (scCO2) 激活,扭转结构变化并恢复多孔性.
主要成果:
- 具有扩大π系统或氧功能的TAPB-COF显示对溶剂刺激的稳定性.
- 具有非替代线性构件的TAPB-COF在暴露于溶剂时显示出可逆的结晶性和多孔性损失.
- 超临界二氧化碳 (scCO2) 有效地将无孔,无形的COF聚合物转化为高度结晶,多孔的框架.
结论:
- TAPB-COF的框架结构对化学刺激有动态反应,允许可逆控制孔隙性和结晶性.
- 交替暴露于溶剂和scCO2激活提供了一种用于动态控制COF属性的方法.
- 这种动态反应为先进的分子选和响应材料开辟了道路.
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