Synthesis, characterization and application of defective metal–organic frameworks: current status and perspectives

Abstract

Defects are now recognized to be a useful tool in tailoring properties of metal-organic frameworks (MOFs). The introduction of missing linker and cluster defects into MOFs provides additional active sites,...

Controlling the molecular diffusion in MOFs with the acidity of monocarboxylate modulators

“…Coordination modulation of Metal-Organic Frameworks (MOFs) 1 highly stable, porous hybrid structures composed of metal clusters linked by multidentate organic ligands [2][3][4] has emerged as a defect engineering tool to enhance their applications and has received notable attention in the last decade. [5][6][7] Defects in Zr MOFs were first reported in 2011 8 by thermogravimetric analysis of modulated Zirconium UiO-66 MOFs revealing a linker deficiency, which was further agreed by EXAFS showing a loss of ligands in the first Zr coordination shell, compensated by monotopic ligands, the so-called modulators. Modulators are typically monotopic ligands that are introduced during MOF synthesis and they compete with multitopic linkers for metal nucleation sites.…”

Synthesis and Photobehavior of a New Dehydrobenzoannulene-Based HOF with Fluorine Atoms: From Solution to Single Crystals Observation

“…For T12F-COOMe, the 3.2 and 14.0 ns components reflect the emission of molecules that have undergone an ICT reaction and those π–π interacting, respectively. However, we cannot exclude that the short component might reflect the presence of defects as the material is clearly amorphous, opening the door to several relaxation pathways, as has been observed even in crystalline structures of MOFs and HOFs [ 9 , 23 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ].…”

Recent advances on the removal of dyes from wastewater using various adsorbents: a critical review

“…Besides, larger surface areas, multi-functionality, polar/polarisable bonds, and the possibility of the presence of host-guest interactions through the chemical amendments of the organic ligands and/or the inorganic subunits are also likely to play a unique role. [250][251][252][253][254][255] According to Li et al, MIL-53(Al)-NH 2 could rapidly bind with MB (208.3 mg/g) and MG (164.9 mg/g) due to hydrogen bonding between amino groups of the dyes and MOF. Further, MIL-Ti MOFs aided with ultrasound adsorbed basic red 46, basic blue 41, and MB from single and binary systems exhibited their maximum adsorption capacity of 1250, 1428, and 833 mg/g, respectively.…”