A stable metal cluster-metalloporphyrin MOF with high capacity for cationic dye removal

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 6; no. 36; pp. 17698 - 17705
• Main Authors: Wang, Zheng, Zhang, Jian-Hua, Jiang, Ji-Jun, Wang, Hai-Ping, Wei, Zhang-Wen, Zhu, Xunjin, Pan, Mei, Su, Cheng-Yong
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 2018
• Subjects: Adsorption; ambient temperature; Carbon dioxide; Cationic dyes; Cations; Color removal; coordination polymers; copper; Copper chloride; Crystal structure; Crystallography; dimethylamine; Dyes; gentian violet; hydrogen bonding; Hydrogen bonds; ligands; Metal clusters; Metal-organic frameworks; Methane; methylene blue; nitrogen; Pollutants; porphyrins; solvents; Topology; X ray powder diffraction; X-ray diffraction
• ISSN: 2050-7488; 2050-7496; 2050-7496
• DOI: 10.1039/C8TA06249H

A metalloporphyrin Cu 5 -cluster based MOF (metal–organic framework), [Cu 4.5 ((H 4 TZPP)(TZPP)Cl 2 )(H 2 O) 0.5 ]·CH 3 NH 2 CH 3 ·7EtOH·8H 2 O (LIFM-WZ-3) was synthesized from the tetrapodal ligand 5,10,15,20-tetrakis[4-(2,3,4,5-tetrazolyl)phenyl]porphyrin (H 6 TZPP) and copper chloride. LIFM-WZ-3 exhibits a rare 2D + 3D → 3D interpenetration topology, of which the frl-type 3D MOF and a layered 2D HOF (hydrogen bond organic framework) are intertwined, leading to an anionic framework with 1D spindle-like channels. Powder X-ray diffraction analysis reveals that the framework is stable in acid, base and various organic solvent environments. LIFM-WZ-3 exhibits moderately high separation performances for CO 2 /CH 4 , CO 2 /N 2 , C 3 H 6 /CH 4 , C 2 H 6 /CH 4 , and C 2 H 4 /CH 4 at room temperature. Specifically, the anionic framework in LIFM-WZ-3 containing dimethylamine cations can selectively adsorb cationic organic dyes from aqueous pollutants for recycle purpose. The high adsorption capacity for methylene-blue (MB + , 983 mg g −1 ) and crystal violet (CV + , 713.5 mg g −1 ) ranks the highest among those MOFs ever reported.