Two-dimensional, conductive niobium and molybdenum metal–organic frameworks

Abstract

<p>Incorporation of Nb and Mo into conductive metal–organic frameworks enables utilization of the enhanced covalency, redox activity, and spin–orbit coupling of late-row metals to improve the transport and magnetic properties of these materials.</p>

Strong Magnetocrystalline Anisotropy Arising from Metal–Ligand Covalency in a Metal–Organic Candidate for 2D Magnetic Order

“…Based on this experimental evidence for magnetocrystalline anisotropy presented in 2 , the magnetic properties of mechanically exfoliated layers merit further characterization. Similar metal–chloranilate framework materials have been exfoliated in solution, but monolayers have not been isolated. , To assess if monolayers of 2 could be directly isolated using mechanical exfoliation, we attempted exfoliation using the Scotch tape method. Atomic force microscopy (AFM) images of the exfoliated material revealed micron-sized flakes with thicknesses as low as 35 nm, corresponding to ∼35 layers, and step edges of 2 nm, corresponding to bilayers of 2 (Figure ).…”

Functionalized hybrid magnetic catalytic systems on micro- and nanoscale utilized in organic synthesis and degradation of dyes

“…Mononuclear niobium and molybdenum sites in MOFs display a wide variety of second-and third-row transition metals for stronger magnetic coupling in frameworks. 79 The preferred method for the synthesis of magnetic MOFs is the solvothermal method, sometimes coupled with microwave and ultrasonication treatment. 78,80 Recently, Espallargas et al synthesized 2D Fe-based magnetic MOF nanosheets named MUV-1-X via a liquid exfoliation method.…”

Structural Characterization of a High‐Nuclearity Niobium(V) Carboxylate Cluster Based on Pivalic Acid

“…[20,21] Tellingly, only few instances of niobium incorporation into MOFs have been reported so far [22 -26] with only one recent example of monometallic de novo synthesized framework, which is based on deprotonated 3,6-dichloro-2,5-dihydroxybenzoquinone rather than a carboxylate linker. [27] Partly driven by the surprising lack of carboxylatebased Nb MOFs, we sought to explore the fundamental carboxylate chemistry of niobium, including Nb clusters. Here, we document the discovery of a niobium pivalate (piv) cluster derived from niobium (V) ethoxide, which displays the highest nuclearity among carboxylate-supported Nb systems.…”

“…Niobium has a highly oxophilic character (particularly in higher oxidation states), large covalent radius, and fluxional coordination sphere, [19] rendering the controlled precipitation of well‐defined crystalline solids in classical de novo fashion challenging [20,21] . Tellingly, only few instances of niobium incorporation into MOFs have been reported so far [22–26] with only one recent example of monometallic de novo synthesized framework, which is based on deprotonated 3,6‐dichloro‐2,5‐dihydroxybenzoquinone rather than a carboxylate linker [27] . Partly driven by the surprising lack of carboxylate‐based Nb MOFs, we sought to explore the fundamental carboxylate chemistry of niobium, including Nb clusters.…”