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Updated: Dec 30, 2025
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
Published on: February 10, 2023
Two Six-Connected MOFs with Distinct Architecture: Synthesis, Structure, Adsorption, and Magnetic Properties
Guo-Jian Ren1, Song-De Han1, Yan-Qing Liu2
1College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Abstract:
By assembling CoII ions and a combination of 5-(4-pyridyl)tetrazole (4-ptz) and formate ions, two distinct metal-organic frameworks, [Co3 (4-ptz)5 (HCOO)(H2 O)2 ] and [Co3 (4-ptz)4 (dmf)2 (HCOO)2 ] (dmf=N,N'-dimethylformamide), were synthesized. They were both characterized by single-crystal X-ray diffraction, IR spectroscopy, thermogravimetric analysis, and powder X-ray diffraction. Structural analyses revealed that by slightly modulating the coordination environment of the trinuclear cobalt cluster, two complexes were formed featuring unusual six-connected nets reminiscent of a pyrazole-type linear trinuclear cobalt cluster as compared with the classic eight-connected bcu topology. In addition, [Co3 (4-ptz)5 (HCOO)(H2 O)2 ] interacted strongly with CO2 , with an adsorption enthalpy of 29.2 kJ mol-1 , and in a selectivity study, the uptake ratios of CO2 /N2 (from a 15:85 mixture) and CO2 /CH4 (50:50 mixture) were 77.6 and 37.7, respectively. Magnetic studies on both complexes revealed weak antiferromagnetic coupling between the CoII ions.
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