CFA-7: an interpenetrated metal–organic framework of the MFU-4 family

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).

High Volumetric Hydrogen Storage Capacity using Interpenetrated Metal–Organic Frameworks

“…Intergrowth of two or more frameworks is often observed for long linkers, leading to structures with reduced specific surface area and smaller pore diameters. Recently, CFA‐7 has been synthesized as the first example of an interpenetrated network of the MFU‐4 family . Measuring the hydrogen uptake for non‐interpenetrated MFU‐4 l and interpenetrated CFA‐7 will directly reveal the impact of interpenetration on the gravimetric and volumetric storage capacities (Scheme ).…”

Synthesis, Thermal Stability, and Magnetic Properties of a Manganese(II) Coordination Framework Containing Bistriazolate Ligands

“…Single crystal X-ray diffraction analysis revealed that the Mn(II) coordination framework [Mn 3 (C 6 N 6 O 2 ) 2 (OH) 2 (H 2 O) 4 ] crystallizes in the monoclinic crystal system in the space group P2 1 /n (no. 14, Table 1).…”

“…14, Table 1). An ORTEP-style plot of the asymmetric unit of 4 ] is shown in Figure S2 (Supporting information). An ORTEP-style plot of the asymmetric unit of 4 ] is shown in Figure S2 (Supporting information).…”

“…[12] They showed that in the porous metal azolate framework (MAF-X25) having a honeycomb-like structure, the Mn(II) ions could be post-synthetically oxidized to Mn(III) to achieve drastic increase of catalytic oxidation performance. Later Dincă et al reported on a structurally related MOF, based on an extended bisbenzotriazole ligand, bis(1H-1,2,3-triazolo [4,5-b], [4′,5′-i])dibenzo [1,4]dioxin (3), and Mn(II) cations. [13] This MOF, also displaying a honeycomb-like network, was shown to be the framework is formed by bistriazolate and hydroxido ligands, Mn(II) cations (with two different coordination environments), and coordinated water molecules.…”

“…Another triazolate ligand, benzotriazole-5-carboxylic acid (4), was reported to be very useful in preparing Mn(II) MOFs, especially those with interesting magnetic properties. Another triazolate ligand, benzotriazole-5-carboxylic acid (4), was reported to be very useful in preparing Mn(II) MOFs, especially those with interesting magnetic properties.…”