Lanthanide dimers in coordination chains constructed by sole dicarboxylate ligand for single-molecule magnet behavior and magnetocaloric effect

Assembly of dysprosium(iii) cubanes in a metal–organic framework with an ecu topology and slow magnetic relaxation

“…S1, ESI†) were isolated by a solvothermal reaction of Dy(NO 3 ) 2 ·6H 2 O and H 4 dhbdc ligands at 100 °C (see details in the ESI†). Combined with our previous experimental results, 15 the changed solvent systems and ligand–metal ratio have a significant effect on the final product. The purity of the bulk synthesized material of Dy 4 -MOF was confirmed by the powder X-ray diffraction (PXRD) pattern (Fig.…”

“…Furthermore, the structural changes will lead to distinct thermal stability, adsorption, and magnetic properties. Combined with our previously reported Dy 2 -dimer chain compounds, 15 the new Dy 4 -MOF highlights a significant effect of synthetic procedures for building lanthanide coordination polymers.…”

“…14 Recently, we explored the single-molecule magnetism and magnetocaloric effect in two Ln 3+ (Dy 3+ and Gd 3+ ) dimer coordination chains constructed by a sole dicarboxylate ligand, 2,5-di-hydroxy-benzene-1,4-di-carboxylic acid (H 4 dhbdc). 15 It is well known that the adaptable coordination modes of lanthanide ions enable carboxylate ligands to have multiple coordination directions that are affected by the molar ratio between reactants, synthetic solvents, used anions, pH, and temperature, which promote the formation of diverse connected and geometric polynuclear clusters. Inspired by the above-mentioned facts, we followed our research line to probe the topology and single-molecule magnetism of Ln-MOFs self-assembled by solely H 4 dhbdc ligands.…”

Two Three-Dimensional LnIII Coordination Polymers Exhibiting Luminescent Sensing and a Magnetocaloric Effect

“…The −Δ S m max value is slightly small than the theoretical limiting value of −Δ S m (30.17 J kg –1 K –1 ) for 2 calculated by using the equation −Δ S m = nR ln­(2 S + 1), and the discrepancy may be attributed to the potential antiferromagnetic interaction between the Gd III centers. Recently, Shao’s group reported a similar construction of [Gd 2 ] n coordination polymer from aromatic carboxylic acid ligand with a magnetic entropy change of 20.2 J kg –1 K –1 , which is lower than the 23.56 J kg –1 K –1 reported in this paper . This difference in magnetic entropy change can be attributed to the slightly larger metal/ligand mass ratio ( N Gd / M W ) of the material described in this paper.…”

“…Recently, Shao's group reported a similar construction of [Gd 2 ] n coordination polymer from aromatic carboxylic acid ligand with a magnetic entropy change of 20.2 J kg −1 K −1 , which is lower than the 23.56 J kg −1 K −1 reported in this paper. 38 This difference in magnetic entropy change can be attributed to the slightly larger metal/ligand mass ratio (N Gd /M W ) of the material described in this paper.…”