Post-exfoliation functionalisation of metal-organic framework nanosheets via click chemistry.
Post-exfoliation functionalisation of metal-organic framework nanosheets via click chemistry.
复制标题
通过点击化学对金属有机框架纳米片进行剥离后功能化。
作者：
Nicks J
层状金属有机框架（MOF）的液体剥离形成纳米片（MON）暴露出隐藏的官能团，使其可用于一系列传感和催化应用。在这里，我们展示了如何在剥离后使用高产点击反应来系统地修改 MON 的表面化学，从而调整其表面特性及其在新应用中的使用。通过对本体 MOF 进行常规的合成后官能化，将层状氨基官能化框架转化为叠氮化物官能化框架，产率高达 >99%。然后使用超声波液体剥离形成几层纳米片，并通过使用 Cu(I) 催化的叠氮化物-炔环加成反应进行剥离后功能化来进一步功能化。在这里，我们展示了剥离后功能化的优势，能够：（1）以高产率纳入一系列官能团； (2) 无需进行大量重新表征即可调整纳米片表面特性； (3)添加荧光官能团，使其可用于危险硝基苯的传感。我们预计，通过高产点击反应引入的不同官能团的多功能性将导致 MON 和其他 2D 材料在各种应用中的使用取得进展。
The liquid exfoliation of layered metal–organic frameworks (MOFs) to form nanosheets (MONs) exposes buried functional groups making them useful in a range of sensing and catalytic applications. Here we show how high yielding click reactions can be used post-exfoliation to systematically modify the surface chemistry of MONs allowing for tuning of their surface properties and their use in new applications. A layered amino-functionalised framework is converted through conventional post-synthetic functionalisation of the bulk MOF to form azide functionalised frameworks of up to >99% yield. Ultrasonic liquid exfoliation is then used to form few-layer nanosheets, which are further functionalised through post exfoliation functionalisation using Cu(I)-catalysed azide–alkyne cycloaddition reactions. Here we demonstrate the advantages of post-exfoliation functionalisation in enabling: (1) a range of functional groups to be incorporated in high yields; (2) tuning of nanosheet surface properties without the need for extensive recharacterisation; (3) the addition of fluorescent functional groups to enable their use in the sensing of hazardous nitrobenzene. We anticipate that the versatility of different functional groups that can be introduced through high yielding click reactions will lead to advances in the use of MONs and other 2D materials for a variety of applications.