Cu<sub>3</sub>(BTC)<sub>2</sub> nanoflakes synthesized in an ionic liquid/water binary solvent and their catalytic properties.
basic_science · Level V
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- Record sourced from PubMed, PMID 35920400.
- Also identified by DOI 10.1039/d2sm00749e.
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Abstract
Low-dimensional metal-organic frameworks (MOFs) exhibit enhanced properties compared with three-dimensional (3D) geometry MOFs in many fields. In this work, we demonstrate the synthesis of Cu<sub>3</sub>(BTC)<sub>2</sub> (BTC = benzene-1,3,5-tricarboxylate) nanoflakes in a binary solvent of ionic liquid (IL) and water. Such a MOF architecture has a high surface area and abundant unsaturated coordination metal sites, making them attractive for adsorption and catalysis. For example, in catalyzing the oxidation reactions of a series of alcohols, the Cu<sub>3</sub>(BTC)<sub>2</sub> nanoflakes exhibit a high performance that is superior to Cu<sub>3</sub>(BTC)<sub>2</sub> microparticles synthesized in a conventional solvent. Experimental and theoretical studies reveal that the IL accelerates the crystallization of Cu<sub>3</sub>(BTC)<sub>2</sub>, while water plays a role in stripping the Cu<sub>3</sub>(BTC)<sub>2</sub> blocks that are formed at an early stage through its attack on the crystal plane of Cu<sub>3</sub>(BTC)<sub>2</sub>. Such an <i>in situ</i> crystallization-exfoliation process that uses an IL/water solvent opens a new route for producing low-dimensional MOFs.