Air‐Free Synthesis of a Ferrous Metal‐Organic Framework Featuring HKUST‐1 Structure and its Mössbauer Spectrum

Abstract

Single crystals of the FeII metal‐organic framework (MOF) with 1,3,5‐benzenetricarboxylate (BTC) as a linker were solvothermally obtained under air‐free conditions. X‐ray diffraction analysis of the crystals demonstrated a structure for FeII‐MOF analogous to that of [Cu3(BTC)2] (HKUST‐1). Unlike HKUST‐1, however, the FeII‐MOF did not retain permanent porosity after exchange of guest molecules. The Mössbauer spectrum of the FeII‐MOF was recorded at 80 K in zero field yielding an apparent quadrupole splitting of ΔEQ = 2.43 mm·s–1, and an isomer shift of δ = 1.20 mm·s–1, consistent with high‐spin central iron(II) atoms. Air exposure of the FeII‐MOF was found to result in oxidation of the metal atoms to afford FeIII. These results demonstrate that FeII‐based MOFs can be prepared in similar fashion to the [Cu3(BTC)2], but that they lack permanent porosity when degassed.

A Microporous Titanate‐Based Metal‐Organic Framework for Efficient Separation of Acetylene from Carbon Dioxide

“…Among the diverse adsorbents, the emerging metal-organic frameworks (MOFs) show tremendous advantages due to their large surface areas, tunable pore sizes and diverse structural functionalities. [18][19][20][21][22][23][24] In the C 2 H 2 /CO 2 separation process, adsorption selectivity and C 2 H 2 uptake capacity are two equally important criteria that determine the separation performance. Since the two gas molecules have the same molecular size/shape (3.3 Å for both C 2 H 2 and CO 2 ), fine tuning of pore size or flexibility on MOFs is quite limited to achieve high separation performance.…”

“…So far, a large number of porous materials have been developed for C 2 H 2 /CO 2 separation. Among the diverse adsorbents, the emerging metal‐organic frameworks (MOFs) show tremendous advantages due to their large surface areas, tunable pore sizes and diverse structural functionalities [18–24] . In the C 2 H 2 /CO 2 separation process, adsorption selectivity and C 2 H 2 uptake capacity are two equally important criteria that determine the separation performance.…”

Tuning topological networks in MOFs by secondary‐building‐unit connection: syntheses, structures and luminescent properties of two Zn4‐cluster coordination polymers

“…It is well-known that decades of progress in CP chemistry flourishes a new branch, namely metal-organic frameworks (MOFs) with secondary building units (SBUs). [8][9][10][11][12][13][14][15][16][17][18][19] Success in employing building-block strategy is indeed beneficial to the rigid behavior of the resultant frameworks. [20][21] Therefore, it is very easy for us to tailor their robust frameworks into a series of isoreticular MOFs.…”

ZnII and CdII Metal Organic Frameworks Based on 2‐Methyl‐6‐oxygen‐1,6‐dihydro‐3,4'bipyridine‐5‐carbonitrile

“…Until now, a desired number of MOFs have been synthesized. [1,[5][6][7]21] Some reports confirmed bimetal-organic frameworks as supercapacitor electrode materials; [22] nanosized MOFs loading Ag/AgBr for photocatalysis; [23] anionic MOFs afforded C 2 H 2 /CO 2 and C 2 H 2 /CH 4 separation and removal of organic dyes; [24] MOFs for selective Cd 2+ detection and cell imaging; [25] Ag-enhanced MOFs for photodegradation of methyl blue; [26] Tb 3+ /Eu 3+ Co-Doped MOFs for ratiometric luminescence temperature sensing. [27] In the design and construction of MOFs, poly-carboxylate ligands have been also properties.…”