Abstract
The novel interpenetrated metal-organic framework CFA-7 (Coordination Framework Augsburg University-7), [Zn5Cl4(tqpt)3], has been synthesized containing the organic linker {H2-tqpt = 6,6,14,14-tetramethyl-6,14-dihydroquinoxalino[2,3-b]phenazinebistriazole}. Reaction of H2-tqpt and anhydrous ZnCl2 in N,N-dimethylformamide (DMF) yields CFA-7 as pseudo-cubic crystals. CFA-7 serves as precursor for the synthesis of isostructural frameworks with redox-active metal centers, which is demonstrated by postsynthetic metal exchange of Zn(2+) by different M(2+) (M = Co, Ni, Cu) ions. The novel framework is robust upon solvent removal and has been structurally characterized by single-crystal X-ray diffraction, TGA and IR spectroscopy, as well as gas sorption (Ar, CO2 and H2).
Highlights
The appearance of interpenetration in metal–organic frameworks (MOFs) has been described for a lot of MOFs in many articles.[1]
The H2-tqpt ligand was synthesized in three steps
The 2,2,5,5tetramethylcyclohexane-1,3-dione and the 3,3,6,6-tetramethylcyclohexane-1,2,4,5-tetraone were synthesized by conventional procedures.[12]
Summary
The appearance of interpenetration in metal–organic frameworks (MOFs) has been described for a lot of MOFs in many articles.[1] The phenomenon has a great impact on the framework structure, and on potential functional properties of the resulting three-dimensional porous materials.[2]. Interpenetration, i.e. the occurrence of two or more structurally independent networks which are intergrown with each other, is a frequently observed phenomenon in MOF structural chemistry. Interpenetration in MOFs often leads to a reduced specific surface area of the network. On the other hand, interpenetrated frameworks may feature some additional advantages such as improved network stability, increased heat of adsorption for certain molecular probes or enhanced molecular size selectivity.3c,4
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