1. Two Six-Connected MOFs with Distinct Architecture: Synthesis, Structure, Adsorption, and Magnetic Properties.
- Author
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Ren, Guo‐Jian, Han, Song‐De, Liu, Yan‐Qing, Hu, Tong‐Liang, and Bu, Xian‐He
- Subjects
METAL-organic frameworks ,CHEMICAL synthesis ,ADSORPTION (Chemistry) ,MAGNETIC properties ,DIMETHYLFORMAMIDE ,X-ray diffraction - Abstract
By assembling Co
II 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. [ABSTRACT FROM AUTHOR]- Published
- 2016
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