A Six-Coordinate Dysprosium Single-Ion Magnet with Trigonal-Prismatic Geometry

Abstract

A mononuclar six-coordinate dysprosium complex was synthesized and structurally and magnetically characterized. X-ray structural analyses show trigonal-prismatic coordination geometry of the Dy center. Slow relaxation of magnetization in the absence of a direct-current field and magnetic hysteresis up to 3.0 K could be observed, indicating its single-ion-magnet behavior. Arrhenius fitting and ab initio calculations suggest that the magnetic relaxation process may not occur through the Orbach process at high temperatures under the experimental conditions.

Mononuclear Dysprosium Alkoxide and Aryloxide Single‐Molecule Magnets

“…Complex 6.4 was reported by Liu et al. in 2017, [68] and has the Dy III centre in a trigonal prismatic geometry (Figure 11). It showed magnetic hysteresis up to 3 K in the absence of an external magnetic field, with a U eff of 190 K. Giansiracusa et al reported 6.5 recently [69] .…”

Synthesis, structure and magnetic properties of a series of Ln(iii) complexes with radical-anionic iminopyridine ligands: effect of lanthanide ions on the slow relaxation of the magnetization

“…[27][28] However, the presented systems exhibit a crystalloprahically imposed trigonal symmetry which should provide mixed m J states. Although, zero-field slow relaxation in six-coordinate lanthanide complexes is rather scarce, [45][46][47] complex 2 is the first example of a zero-field undiluted SMM with such imposed symmetry. This suggests that despite being weak, the exchange interactions may affect the relaxation.…”

Six-Coordinate Ln(III) Complexes with Various Coordination Geometries Showing Distinct Magnetic Properties

“…]} and HN* = HN(SiMe3)2) with trigonal-prismatic coordination geometry, exhibited a high energy barrier Ueff = 190 K under a zero dc field [33]. It is crucial to note that the magnetic axis is approximately collinear to the direction of [N*] − -N, resulted from the strong axial-ligand field improved by the short Dy-N([N*] − ) bond lengths of 2.296 Å.…”