A Dy₂ dimer derived from a two-dimensional network with a high U_eff value

Abstract

A new two-dimensional dysprosium–organic coordination polymer 1-Dy has been synthesized by a hydrothermal method. 1-Dy displays a ferromagnetic interaction between two DyIII ions within the Dy2 dimer and a slow magnetic relaxation with a high effective energy barrier of approximately 160 K under a zero dc field.

Significantly Enhancing the Single-Molecule-Magnet Performance of a Dinuclear Dy(III) Complex by Utilizing an Asymmetric Auxiliary Organic Ligand

“…The other is the strong intramolecular exchange coupling in 1, which was confirmed by the results of the theoretical calculations. We believe that the former might be the main reason, as the magnetic relaxation bahavior of 1 mainly arises from individual Dy III fragments/centers, 10a, 15,30,44 though the presence of intramolecular magnetic couplings in 1 also makes a small contribution to its magnetic relaxation. To our knowledge, complex 1 can be viewed as the first example where the magnetic relaxation behavior is clearly affected by the charge distribution of the coordination atoms around the Dy III ion through regulation of the Dy 2 SMMs with the same/similar topologies by an asymmetrical auxiliary organic ligand.…”

Rationally Designing Metal–Organic Frameworks Based on [Ln2] Magnetic Building Blocks Utilizing 2-Hydroxyisophthalate and Fine-Tuning the Magnetic Properties of Dy Analogues by Terminal Coordinated Solvents

“…Among the reported [Ln 2 ]-MBB-based MOFs (Table S2), most of the intra-MBB magnetic bridges are O enol ,, or carboxylate groups. ,,, Other [Ln 2 ]-MBBs based on bridges of O N‑oxide or OH – ions were also reported. However, until now, there were few reports about the MOFs based on O phenol -bridged [Ln 2 ] MBBs.…”

“…Gd-MOFs (MOFs = metal–organic frameworks) with high-dimensional topologies are conducive to obtaining larger MCE because they usually possess higher magnetic densities than those discrete Gd clusters. − Relatively, the rational construction and modification of the coordination geometries of the Dy III centers and the magnetic bridges in MOFs, which aim to improve the SMM performance via perturbation of the single-ion anisotropy and magnetic interactions, is much more elusive than that that in discrete Dy-SMMs . This led to the fact that Dy-MOFs with high SMM performance were still scarcely documented (Table S1), − even though so many well-behaved discrete Dy-SMMs have sprung up. − Therefore, continuous efforts should be devoted to synthesizing novel Ln-MOFs based on either their advantages for large MCE or their challenges in realizing high SMM performance.…”

“…Nevertheless, from a survey of the literature, it could be learned that these [Ln 2 ]-MBB-based MOFs have not yet been fully explored (Table S2). ,− The structural types of reported [Ln 2 ]-MBBs, especially for the kinds of magnetic bridges within [Ln 2 ]-MBBs, have been rather sparse so far.…”

Dinuclear Tb and Dy complexes supported by hybrid Schiff-base/calixarene ligands: synthesis, structures and magnetic properties

“…17,18 Several dinuclear terbium [19][20][21][22][23][24] and dysprosium complexes with SMM behaviour have been reported. 16,[25][26][27][28][29][30][31][32] Most are mixed-ligand complexes, with the coordination spheres often being partly completed by solvate molecules or the anions. We previously reported a hybrid Schiff-base/calixarene ligand H 4 L 1 (Fig.…”