Reversible coordinative binding and separation of sulfur dioxide in a robust metal–organic framework with open copper sites

Comparative Evaluation of Different MOF and Non‐MOF Porous Materials for SO2 Adsorption and Separation Showing the Importance of Small Pore Diameters for Low‐Pressure Uptake

“…Upon desorption the diffraction data under a dynamic vacuum at 298 K left the Cu 2+ ‐bound SO 2 with an occupancy of 0.09 which suggests that due to the Jahn–Teller effect the Cu‐OSO bonding is weak so that it is almost entirely desorbed on the reduction of pressure. [ 21 ] On the other hand, ZIF‐8 and ZIF‐67 neither have metal‐OH nor open metal sites, contributing to a low affinity, besides the low uptake due to the gate‐opening effect (vide supra).…”

“…Currently, the SO 2 adsorption with metal–organic frameworks (MOFs) experiences high interest. [ 11–27 ] Metal–organic frameworks are typically microporous metal‐ligand coordination networks with uniform porosity, low density, and high tunability through the organic linker, that is, the metal‐bridging ligand. [ 28 ] MOFs are actively studied in the role of adsorbents (particularly N 2 , H 2 , CO 2 , CH 4 , etc.)…”

Tailoring the Pore Size and Chemistry of Ionic Ultramicroporous Polymers for Trace Sulfur Dioxide Capture with High Capacity and Selectivity

“…Porous materials including zeolites, [5] activated carbons, [6] covalent organic frameworks (COFs) [7] and metal‐organic frameworks (MOFs) [8] have been widely investigated for replacing traditional alkaline solvents [2, 9] . Among these porous materials, MOFs with designability and tuneability can be easily decorated with strong binding sites to increase the uptake capacity of SO 2 at ultra‐low pressure (SIFSIX‐2‐Cu‐i: 2.31 mmol g −1 at 0.002 bar) [8a] and high pressure (MFM‐170: 17.5 mmol g −1 at 1.0 bar) [8f] at 298 K. For crystalline ultramicroporous materials, by introducing inorganic anion (such as BF 4 − and SiF 6 2− ), which possess strong electrostatic interaction with SO 2 , multiple synergistic host–guest and guest–guest interactions achieve superior SO 2 adsorption capacity [8a] . However, the competitive adsorption of CO 2 decreased the separation selectivity of SO 2 /CO 2 and only a small number of MOFs have been demonstrated selective capture of SO 2 from CO 2 .…”

Metal-organic Framework-based Materials: Synthesis, Stability and Applications in Food Safety and Preservation

“…structure, [31,32] and abundant binding sites (open metal sites and ligands) for guest molecules. [33] These endow MOFs as promising candidates for successful applications in various fields, such as gas separation, [34][35][36][37][38][39][40][41][42][43] energy storage, [23,37] chemical catalysis, [36,44,45] drug delivery, [27,[46][47][48][49][50][51] and sensor development. [52][53][54] Based on our knowledge, the largest pore aperture of MOF is 9.8× 8.5 nm, belonging to one of the isoreticular MOF (IRMOF) structures termed IRMOF-74-XI with Orth hexagonal pores and ring of 282atoms through conventional synthesis and coordinative linking Zn 2+ /Mg 2+ and polymerized 2,5-dioxidoterephthalate or derivatives.…”