title: Facile purification of porous metal terephthalates with ultrasonic treatment in the presence of amides.
abstract: A facile purification method for metal-organic frameworks (MOFs), especially the ones containing insoluble 1,4-benzenedicarboxylic acid (terephthalic acid) in the pore, has been suggested. The purification method consists of the treatment of the MOF with amides such as N,N-dimethylformamide, especially under ultrasound treatment. The purification is completed within 1 h at 70 degrees C as has been confirmed by XRD, nitrogen adsorption, FTIR and TGA measurements. The purification method proved to be simple, one-step, fast and energy-efficient. The MOFs purified by the proposed method show high surface area and micropore volume, confirming the efficiency of the method. The proposed method will lead to a new access to activate (for example, to remove carboxylic acids) MOFs that are unstable above around 100 degrees C. Additionally, the method may be used to transform a non-porous MOF-type material into a porous MOF structure. However, adequate solvents will be necessary for the facile purification of MOFs.
authors.affiliation: Department of Chemistry, Kyungpook National University, Daegu 702-701, Korea.
authors.forename: Enamul
authors.initials: E
authors.lastname: Haque
authors.forename: Nazmul Abedin
authors.initials: NA
authors.lastname: Khan
authors.forename: Ji Eun
authors.initials: JE
authors.lastname: Lee
authors.forename: Sung Hwa
authors.initials: SH
authors.lastname: Jhung
mesh_terms: D004126:Dimethylformamide; D005559:Formamides / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D010795:Phthalic Acids / Q000737:chemistry*; D016062:Porosity; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature; D014465:Ultrasonics; D014961:X-Ray Diffraction
chemical_list: D005559:Formamides; D008670:Metals; D010795:Phthalic Acids; C011363:terephthalic acid; D004126:Dimethylformamide