Synthesis and study of a new Zn (II) MOF
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DRUŢĂ, Vadim, VODĂ, Irina, BOUROSH, Pavlina, LOZAN, Vasile. Synthesis and study of a new Zn (II) MOF. In: Ecological and environmental chemistry : - 2017, Ed. 6, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, Ediția 6, p. 159.
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Ecological and environmental chemistry
Ediția 6, 2017
Conferința "Ecological and environmental chemistry 2017"
6, Chișinău, Moldova, 2-3 martie 2017

Synthesis and study of a new Zn (II) MOF


Pag. 159-159

Druţă Vadim1, Vodă Irina1, Bourosh Pavlina2, Lozan Vasile1
 
1 Institute of Chemistry of the Academy of Sciences of Moldova,
2 Institute of Applied Physics, Academy of Sciences of Moldova
 
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Disponibil în IBN: 15 martie 2019


Rezumat

Coordination polymers recently known as metal-organic frameworks (MOFs) have become a forefront in scientific research and public interest, due to the potential for neutral guest bonding including gas storage studies such as hydrogen storage and gas separations The aim of this work was the synthesis, determination of the composition, structure, and sorption properties of Zn (II) MOFs using rigide ligands. There we report a method of solvothermal synthesis of Zn(II) complex using 2, 3, 5, 6-tetramethyl-1, 4-carboxyphenyl benzene (4-CH3-TF) and bis-imidazolyl-bis-phenylene (BIBPh) as starting ligands. The synthesized product represents a tridimensional polymeric compound [Zn2 (4-CH3-TF) 2(BIBPh) (DEF)] n. The composition and structure of complex was demonstrated by physical methods of analyses (X-ray, thermogravimetry, EA, IR). Single crystal X-ray structure investigation of coordination compound has demonstrated, that in the crystalline phase an polymeric structure was obtained, where binuclear Zn(II) groups are interconnected by two bridging tetradentate molecules of 4-CH3-TF ligand and one bidentate BIBPh. Two types of large cavities were identified in the polymer, where solvent molecules of DEF are adsorbed. Thermogravimetric study has demonstrated, that heating of polymeric sample up to 250 °C leads solely to elimination of solvent molecules from micropores. The degassed compound is stable up to 400 °C, then an irreversible collapse of molecular framework is occuring. Sorption properties have been tested through N2 adsorption at 77 K and shown a maximum sorption value of ~110 cm3/g. The surface area (SBET = ~330 m2/g) is relatively moderate comparing with known highest values for MOFs. Molecular packing of the polymeric compound [Zn2(4-CH3-TF)2(BIBPh)(DEF)]n