Minute-MOFs: Ultrafast Synthesis of M2(dobpdc) Metal–Organic Frameworks from Divalent Metal Oxide Colloidal Nanocrystals

详细信息    查看全文

• 作者：Lorenzo Maserati ; Stephen M. Meckler ; Changyi Li ; Brett A. Helms
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：March 8, 2016
• 年：2016
• 卷：28
• 期：5
• 页码：1581-1588
• 全文大小：626K
• ISSN：1520-5002

文摘

The material demands for metal–organic frameworks (MOFs) for next-generation energy-efficient CO₂ capture technologies necessitate advances in their expedient and scalable synthesis. Toward that end, the recently discovered expanded MOF-74, or M₂(dobpdc), where M = divalent metal cation and dobpdc = 4,4′-dioxido-3,3′-biphenyldicarboxylate, can now be prepared in minutes via a controlled dissolution–crystallization route from divalent metal oxides as precursors. We show that the available surface area of the metal oxide plays a critical role in the precursor dissolution, which was found to be rate-limiting. Based on this understanding of the reaction trajectory, we pushed the chemical transformation to its fringe kinetic limit by configuring the metal oxide precursors as ligand-free colloidal metal oxide nanocrystals, which allowed MOF formation in less than 1 min. MOFs prepared by this strategy were highly crystalline, with BET surface areas on par with conventional multihour syntheses from metal halide salts. This method was also applied successfully in the synthesis of M₂(dobdc) MOFs, highlighting its generality. Our work challenges the conventional wisdom that plurality of steps in MOF formation is inherently time-intensive.