Synthesis, crystal structures and magnetic properties of a series of chair-like heterometallic [Fe₄Ln₂] (Ln = Gd^III, Dy^III, Ho^III, and Er^III) complexes with mixed organic ligands

Abstract

Four chair-like [Fe4Ln2] (Ln = Gd, Dy, Ho and Er) complexes with mixed organic ligands have been obtained. [Fe4Dy2] exhibits single molecule magnet behavior.

Modulating the structural topologies from star-shape to cross-shape for Co–Dy heterometallic complexes with slow magnetic relaxation behavior

“…10 Therefore, people concentrated on the investigation of 3d–Dy SMMs, because the magnetic coupling between 3d and Dy III is usually higher than that between Dy III ions. 11–13…”

Heterometallic (3d-4f) Coordination Clusters with Unique Topology: Self-Assembly Synthesis, Structural Features, and Magnetic Properties

“…Compounds containing iron are still rare in Gd III -based molecular cooler materials or Ln-based SMMs (Ln = Tb III , Dy III , Ho III , and Er III ) . Recently, some iron-lanthanide systems have been reported, namely, Fe III Ln III , Fe III 2 Ln III 2 , Fe III 3 Ln III 2 , − Fe III 4 Ln III 2 , − Fe III 4 Dy II 4 , Fe III 4 Ln II 4 , Fe III 4 Ln III 6 , Fe III 5 Ln III 8 , Fe III 6 Ln III 2 , Fe III 6 Ln III 3 , Fe III 6 Ln III 4 , Fe III 6 Gd III 6 P 6 , Fe III 7 Ln III 3 , , Fe III 7 Ln III 4 , Fe III 12 Ln III 4 , Fe III 16 Ln III 4 , Fe III 12 Sm III 4 and Fe III 24 Sm III 8 . To isolate 3d-4f clusters, a mixed ligand approach is potentially attractive to achieve a diversity of chelating and bridging modes and saturate vacant coordination sites of metal nodes. , In particular, N -substituted diethanolamine ligands are easily available, stable, versatile, and flexible, showing N- and O- coordination sites and a varying degree of deprotonation.…”

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

“…Particularly, the effective energy barrier ( U eff ) and/or blocking temperature ( T B ) of the Dy­(III)-based SIMs could be increased when the Dy III ion is located in a local coordination environment with high axial symmetry, such as D 3 h , D 4 d , D 5 h , and C ∞ v . Following this strategy, some brilliant Dy­(III)-based SIMs with the recorded U eff and/or T B have been reported . However, there are still many Dy­(III)-based SIMs displaying “butterfly”-shaped hysteresis loops, which could be ascribed to the sudden decrease or even disappearance of remanence and coercivity resulting from the fast quantum tunneling of magnetization at zero field .…”