Four Isostructural 3d-4f Mixed Metal Organic Frameworks and Their Magnetic Properties

Abstract

Four new isostructural 3d-4f mixed metal organic frameworks (MOFs) Cu Gd2 (BDC)4, compound 1, Cu Ho2 (BDC)4, compound 2, Cu Eu2 (BDC)4, compound 3, and Cu Dy2 (BDC)4, compound 4 were successfully synthesized. The structure, stability, and magnetic properties were analyzed. Each MOF has two lanthanide ions and one copper ion node with terephthalic acid as the organic linker. The lanthanide ions form a dimer with each having a capped trigonal prismatic geometry while the copper ion has a square planar geometry. Each of these MOFs shows varying degrees of antiferromagnetic interactions.

Fluorine extraction from organofluorine molecules to make fluorinated clusters in yttrium MOFs

“…[20][21][22][23][24][25] The RE metal ions tend to form dimers that oen result in MOFs with low porosity. [26][27][28] It has been widely reported that the addition of a modulator can result in RE-MOFs with larger metal clusters. [29][30][31][32] Modulators were originally designed to bind to metal ions to control crystallization rates, oen leading to larger X-ray quality crystals.…”

Synthesis, structure, photoluminescence and magnetism of a series of cobalt‐lanthanide heterometallic complexes originated from 2,3‐dichlorobenzoate and 1,10‐phenanthroline

“…Upon cooling, the χ m T products of 1 , 2 and 4 – 7 decrease slightly and then drop rapidly to the minimum values of 3.81, 2.32, 14.44, 15.03, 22.63 and 15.76 emu mol −1 K at 2 K, respectively. This phenomenon may result from the thermal depopulation of the excited levels of the lanthanide ions and/or the weak antiferromagnetic interactions between the metal centers [40] …”

“…This phenomenon may result from the thermal depopulation of the excited levels of the lanthanide ions and/or the weak antiferromagnetic interactions between the metal centers. [40] The M versus H plots of 1, 2 and 4-7 at 2 K are shown in Figure S13. The magnetization values of 1, 2 and 4-7 increase rapidly from zero to 10 kOe and then rise slowly to the nonsaturated values of 5.61, 2.27, 17.05, 13.97, 15.36 and 15.72 Nβ at 70 kOe, respectively.…”

Lanthanide Metal–Organic Frameworks Exhibiting Fluoro-Bridged Extended Chains: Synthesis, Crystal Structures, and Magnetic Properties

“…The formation of these fluoro-bridged metal clusters allows for closer interactions between the metal centers within the structure. In the absence of fluorinating agents, the lanthanide MOFs typically contain metal dimers with distances further than 4 Å between the nodes, meaning there is very little interaction between the metal ions. − The formation of metal clusters reduces the m–m distance. The addition of fluoro-bridging in the cluster further decreases the distance between metal ions as the metal-fluoride bond is on average shorter than the metal–oxygen bond. , There have been several studies on how the addition of fluoro-bridging within lanthanide complexes changes the magnetic coupling between the lanthanide ions. , Additionally, clusters increase the concentration of the metal ions and help increase the overall magnetic susceptibility of the MOF .…”