Abstract
Current advancements in the chemistry of two dimensional metal organic framework nanosheets (2D MONs) are sketched out in this perspective.
Highlights
Metal–organic frameworks (MOFs) have achieved considerable attention worldwide among researchers owing to their potential applications in various fields including catalysis, sensing, separation, adsorption, electronic and optical devices, drug delivery, photocatalysis, and energy storage devices.[1,2,3,4,5,6,7,8] MOFs, a category of crystalline porous materials, are usually designed by combining the organic linkers with metal nodes using the underlying principle of coordination chemistry.[9]
The connectivity between MON layers can be attained either through organic linkers, which help in bridging the isolated metal ions/clusters or through the joined inorganic clusters, or sometimes a combination of both.27a,b Typically, there is a mixture of hydrogen bonding, dispersive, and ionic interactions for any connectivity in the third dimension that allows the separation of individual layers and makes them isolated
Even though the crystal structure of MOFs were usually resolved with the aid of single-crystal X-ray diffraction (XRD) technique or through the combined agreement between simulation and refinement with powder X-ray diffraction (PXRD), still there is not a single decisive technique in order to determine the structure of 2D metal–organic framework nanosheets (2D MONs).[76,77]
Summary
Metal–organic frameworks (MOFs) have achieved considerable attention worldwide among researchers owing to their potential applications in various fields including catalysis, sensing, separation, adsorption, electronic and optical devices, drug delivery, photocatalysis, and energy storage devices.[1,2,3,4,5,6,7,8] MOFs, a category of crystalline porous materials, are usually designed by combining the organic linkers (e.g. carboxylate ligands or other negatively charged ligands) with metal nodes (e.g. metal ions and clusters) using the underlying principle of coordination chemistry.[9]. The connectivity between MON layers can be attained either through organic linkers, which help in bridging the isolated metal ions/clusters or through the joined inorganic clusters, or sometimes a combination of both.27a,b Typically, there is a mixture of hydrogen bonding, dispersive, and ionic interactions for any connectivity in the third dimension that allows the separation of individual layers and makes them isolated. A myriad of well-established methods has been reported that are concerned with the synthesis of bulk MOF crystals, 0D MOF nanoparticles,[29] and 1D MOF nanorods/ nanowires.[30,31] the synthesis of 2D MONs is still a challenging field as the MOF crystal growth should only be allowed in two lateral directions, suppressing it along the vertical direction.[32]. Some personal perspectives on the challenges and future directions in this favorable research field are stated
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