Imaging defects and their evolution in a metal–organic framework at sub-unit-cell resolution

Cross‐Linked Surface Engineering to Improve Iron Porphyrin Catalytic Activity

“…The larger voids provided by irregular defects in metalized films as the “holes” can effectively enhance the accessibility of active sites, which is conducive to improving their catalytic activity. [ 32–34 ] Hence, the unique QTD ultra‐thin metallized film structural cross‐linked on the surface of hollow skeleton generally exhibits higher catalytic performance than their monomer presence counterparts, mainly due to stabilization of the films through immobilization, the electron deficient iron‐oxo complexes are much better electron acceptors, they will be more powerful oxidants than the corresponding species derived from non‐metal porphyrin molecule, and it can effectively enhance the catalytic activity of porphyrin‐Fe by cross‐linked surface engineering.…”

A New Dimension for Coordination Polymers and Metal–Organic Frameworks: Towards Functional Glasses and Liquids

“…Most MQGs have the same first-sphere coordination geometry as their crystalline counterparts.P DF analysis shows that they preserve periodicity up to around 10 ,w hich is often sufficient to claim metal-ligand-metal periodicity;h owever,t his intensity is weak, and dynamics must also be considered. Advanced TEM techniques can observe the glass structure of o-CPs directly, [44] as has been successfully done for metal glasses. [45] Fast bond cleavage/reformation between metal ions and ligands occurs at around T m and above.S olid-to-solid transition and melting are strongly influenced by the structure of the ligands in the system.…”

Multi‐Spectroscopic Interrogation of the Spatial Linker Distribution in Defect‐Engineered Metal–Organic Framework Crystals: The [Cu3(btc)2−x(cydc)x] Showcase

“…used fluorescence lifetime imaging (FLIM) of tagged UiO‐67 crystals to study the distance between these labeled linkers. Most recently, Liu et al . showed by means of high‐resolution transmission electron microscopy (HRTEM) how ordered defect regions in UiO‐66 crystals form mesopores and change the overall symmetry of the lattice.…”

“…More recently, Schrimpf et al [16] used fluorescencel ifetime imaging (FLIM)o f tagged UiO-67 crystals to study the distance between these labeled linkers. Most recently,L iu et al [17] showedb ym eans of high-resolution transmission electron microscopy (HRTEM) how ordered defect regions in UiO-66 crystals form mesoporesa nd change the overall symmetry of the lattice. Each of the above studies demonstrate the challenges associated with determining the structure of defects within defect-engineered MOFs (DEMOFs).…”