HKUST-1 MOF in reline deep eutectic solvent: synthesis and phase transformation

The fate of HKUST-1 (Cu 3 (BTC) 2 , BTC = 1,3,5-benzenetricarboxylate) in the green Deep Eutectic Solvent (DES) reline (choline chloride/urea 1 : 2) was investigated, highlighting that not only reline can be used to make this MOF but also to transform it into another crystalline material. The synthe...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2021-03, Vol.5 (12), p.4145-4151
Main Authors: Maia, Renata A, Louis, Benoît, Baudron, Stéphane A
Format: Article
Language:English
Subjects:
Chemical analysis
Chemical Sciences
Chlorides
Choline
Coordination chemistry
Infrared analysis
Metal-organic frameworks
Morphology
Phase transitions
Porous materials
Solvents
Synthesis
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Summary:The fate of HKUST-1 (Cu 3 (BTC) 2 , BTC = 1,3,5-benzenetricarboxylate) in the green Deep Eutectic Solvent (DES) reline (choline chloride/urea 1 : 2) was investigated, highlighting that not only reline can be used to make this MOF but also to transform it into another crystalline material. The synthesis of HKUST-1(reline) showing good textural properties and a particular rose morphology was indeed successfully achieved in this solvent. However, upon optimizing the reaction conditions such as concentration and metal/ligand ratio, it was found that another structure Cu 2 (BTC)Cl also forms. It was unequivocally demonstrated that, upon heating in reline, HKUST-1 converts to the non-porous chloride-incorporating material. Hence, a novel feature of DES in MOF synthesis is uncovered: its role as a structure-directing agent, triggering the transformation between two different MOF structures. The HKUST-1 MOF can not only be synthesized in the green deep eutectic solvent reline (choline chloride/urea 1 : 2) but also converts, upon heating in reline, to a 2D non-porous structure incorporating chloride anions.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt00377a