Engineering macrocyclic high performance pentagonal bipyramidal Dy(iii) single-ion magnets

Abstract

We generate a new air-stable pseudo-D5h Dy(III) Single-Molecule Magnet (Ueff = 1108 K, TB = 14 K) by combining a weak equatorial ligand field from a macrocyclic LN5 ligand with...

Correlating axial and equatorial ligand field effects to the single-molecule magnet performances of a family of dysprosium bis-methanediide complexes

“…Furthermore, a recent study demonstrated that equatorial sulfur donors enabled U eff barriers as high as 638 K, with computational investigations showing that heavier group 16 elements would likely further increase the barrier. 10 To date, the effect of axial linearity on magnetic performance has only ever been modelled computationally or observed as a general qualitative trend for incomparable systems. 4 e…”

Attaining record-high magnetic exchange, magnetic anisotropy and blocking barriers in dilanthanofullerenes

“…These U eff and T B values are generally very high for lanthanides, thanks to their strong spin-orbit coupling. [3][4][5][6][7][8][9][10] The enhancement of T B as high as 80 K in "Dysprocenium" complexes was an important breakthrough, replenishing the hope for potential applications in the information storage devices. [11][12][13][14][15] Among others, the important bottlenecks that are likely to hamper the futuristic application of these SMMs are (i) enhancing the blocking temperature beyond 80 K (ii) obtaining molecules that are stable under ambient conditions so that fabrication can be attempted (iii) retaining their intriguing magnetic properties upon fabrication -many best transition metal SMMs failed these criteria.…”

Switching the Local Symmetry from D5h to D4h for Single-Molecule Magnets by Non-Coordinating Solvents

“…, giving the following parameters: for 1, Ueff = 1785(6) K, τ0 = 1.96(4) × 10 -12 s, C = 5.3(6) × 10 -5 s -1 K -n , n = 3.02 (5). These parameters are very similar to other D5h SMMs due to the fact that they share the same coordination geometry [27]. For 2, the equation has been modified with an additional QTM term, which gives Ueff = 2075(11) K, τ0 = 5.61(2) × 10 -13 s, C = 5.60(4) × 10 -3 s -1 K -n , n = 2.85(4) and τQTM = 0.46 s. From these results, we could see that in the higher temperature the relaxation mechanisms for both complexes are similar, whereas in the low temperature region where QTM is effective, the relaxation behavior is disparate for two complexes.…”