Emerging Trends on Designing High-Performance Dysprosium(III) Single-Molecule Magnets

Abstract

The present prospect of single-molecule magnets (SMMs) research is more appealing after the detection of magnetic remanence above liquid-nitrogen temperatures. From the current state-of-the-art of the well matured molecular magnetism perspective, in this Review, we discuss the recent emerging trends on the key synthetic strategies employed to achieve exotic magnetic properties by providing representative seminal reports on high-performance Dy­(III)–SMMs (HP-Dy–SMMs). Special emphasis has been given to monomeric HP-Dy–SMMs realized via crystal field (CF), predominant bond, and organometallic approaches. In addition, recent stimulating reports on endometallofullerenes (EMFs) and radical-bridged systems possessing strong magnetic coupling are encompassed. Likewise, the role of spin-vibration coupling in the magnetic relaxation of Dy­(III) MMs is also highlighted. To this end, we believe more demanding theoretical studies are still anticipated to forecast the promising molecule with magnetization blocking at a practical temperature.

Carbon cage isomers and magnetic Dy⋯Dy interactions in Dy2O@C88 and Dy2C2@C88 metallofullerenes

“…The open magnetic hysteresis indicates that the studied Dy-EMFs are single-molecule magnets, [76][77][78][79][80] and their magnetodynamics was further characterized by measuring the relaxation times τ M at different temperatures. As the sample amount was not sufficient for AC measurements, only DC technique was employed.…”

Impact of Spin-Phonon Coupling on Magnetic Relaxation of a Co(II) Single-Molecule Magnet

“…12 The highest axial magnetic anisotropy has been proclaimed in dysprocenium and related Dy(III) SMMs. 13,14 Subsequently, a large coercive magnetic field of 14 T has recently been reported by Gould et al at temperatures as high as 60 K for a dilanthanide complex of Dy. 15 While, transition metals generally possess weak spin-orbit coupling and their barrier heights are governed by second-order SOC.…”

Lanthanide SMMs Based on Belt Macrocycles: Recent Advances and General Trends

“…Starting from the seminal Mn 12 complex, [22] the chemical diversity of this type of functional molecular materials bloomed to include representative systems from vast areas in inorganic chemistry. Thus examples can be found from polynuclear to mononuclear species, [23][24][25][26][27][28][29][30][31] based on transition metal ions from all rows, [32][33][34][35][36][37][38] lanthanides [39][40][41][42][43][44][45][46] and actinides, [47][48][49][50][51] giving rise to coordination and organometallic compounds. Despite the fundamental differences in electronic structure of this diversity of chemical systems, the essential tuning parameter to achieve improved SMMs is the maximisation of magnetic anisotropy.…”