A reaction-coordinate perspective of magnetic relaxation

Abstract

This tutorial review gives a synthetic chemistry perspective of magnetic relaxation phenomena through the lens of the reaction-coordinate diagram.

Taming salophen in rare earth metallocene chemistry

“…The moderate spin-reversal barrier and the large τ 0 value indicate that the actual barrier is much larger but not accessible through SQUID magnetometry owing to frequency range limitations. Given the intricacy of relaxation pathways, 79,80 with the data on hand, we conclude that the relaxation times are most precisely described by considering solely a Raman mechanism. In accordance with the dynamic magnetic susceptibility data, the variable-field hysteresis measurements afforded a closed magnetic hysteresis at 1.8 K (Fig.…”

Slowing magnetic relaxation with open-shell diluents

“…There are many other relaxation mechanisms that are predicted to be affected by dipolar fields, but these predictions have yet to be quantitatively tested. 60 – 62 Future work will test these theories with the paramagnetic dilution approach, and those results will be presented in due course.…”

Dinitrogen Coordination to a High‐Spin Diiron(I/II) Species

“…Applying a static magnetic field shifts the peaks to lower frequency, evidencing a slowing of the magnetic relaxation process and possible disruption of a contribution from a tunneling relaxation mechanism. [20] Relaxation times (τ) determined with a Debye model support Arrhenius-like behavior with an effective activation energy for relaxation (U eff ) of 16.3 cm À 1 and an attempt time of 1.9 × 10 À 6 s (Figure S23). [21] Although the limited temper-Scheme 1.…”