A novel zinc(II) metal–organic framework with a diamond-like structure: synthesis, study of thermal robustness and gas adsorption properties

0455796 - ÚFCH JH 2017 RIV GB eng J - Článek v odborném periodiku
Almáši, M. - Zeleňák, V. - Zukal, Arnošt - Kuchár, J. - Čejka, Jiří
A novel zinc(II) metal–organic framework with a diamond-like structure: synthesis, study of thermal robustness and gas adsorption properties.
Dalton Transactions. Roč. 45, č. 3 (2016), s. 1233-1242. ISSN 1477-9226. E-ISSN 1477-9234
Grant CEP: GA ČR GA14-07101S
Institucionální podpora: RVO:61388955
Klíčová slova: synthesis * gas adsorption properties * physical chemistry
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 4.029, rok: 2016

A solvothermal reaction of Zn(II) salt with methanetetrabenzoic acid (H4MTB) and 1,4,8,11-tetraazacyclotetradecane (cyclam, CYC) created a new microporous metal–organic framework {[Zn2(μ4-MTB)(κ4-CYC)2]·2DMF·7H2O}n (DMF = N,N′-dimethylformamide). Single crystal X-ray diffraction showed that the complex exhibits a four-fold interpenetrated diamond-like structure topology with 1D jar-like channels with sizes about 14.1 × 14.1 and 2.4 × 2.4 Å2. The stability of the framework and activation conditions of the compound have been studied by high-energy powder X-ray diffraction during in situ heating, thermogravimetric analysis coupled with mass spectrometry and infrared spectroscopy performed at different temperatures. The gas adsorption behaviour of {[Zn2(μ4-MTB)(κ4-CYC)2]·2DMF·7H2O}n was studied by adsorption of Ar, N2, CO2 and H2. Nitrogen and argon adsorption showed that the activated sample exhibits Brunauer–Emmet–Teller (BET) specific surface areas of 644 m2 g−1 (N2) and 562 m2 g−1 (Ar). The complex adsorbs carbon dioxide with a maximum storage capacity of 10.5 wt% at 273 K and 101 kPa. The observed hydrogen uptake was 1.27 wt% at 77 K and 800 Torr, which is the highest value reported for the compounds containing a MTB4− linker. The adsorption heats of carbon dioxide and hydrogen, calculated according to the Clausius–Clapeyron equation, were in the range 22.8–22.4 kJ mol−1 for CO2 and 8.9–3.2 kJ mol−1 for H2, indicating weak interactions of the gases with the framework.

Trvalý link: http://hdl.handle.net/11104/0256432