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Two Six‐Connected MOFs with Distinct Architecture: Synthesis, Structure, Adsorption, and Magnetic Properties
Author(s) -
Ren GuoJian,
Han SongDe,
Liu YanQing,
Hu TongLiang,
Bu XianHe
Publication year - 2016
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201600092
Subject(s) - cobalt , chemistry , formate , thermogravimetric analysis , adsorption , crystallography , metal organic framework , pyrazole , infrared spectroscopy , antiferromagnetism , dimethylformamide , cluster (spacecraft) , selectivity , powder diffraction , inorganic chemistry , stereochemistry , organic chemistry , catalysis , physics , solvent , computer science , programming language , condensed matter physics
By assembling Co II ions and a combination of 5‐(4‐pyridyl)tetrazole (4‐ptz) and formate ions, two distinct metal–organic frameworks, [Co 3 (4‐ptz) 5 (HCOO)(H 2 O) 2 ] and [Co 3 (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, [Co 3 (4‐ptz) 5 (HCOO)(H 2 O) 2 ] interacted strongly with CO 2 , with an adsorption enthalpy of 29.2 kJ mol −1 , and in a selectivity study, the uptake ratios of CO 2 /N 2 (from a 15:85 mixture) and CO 2 /CH 4 (50:50 mixture) were 77.6 and 37.7, respectively. Magnetic studies on both complexes revealed weak antiferromagnetic coupling between the Co II ions.