Exchange coupling and magnetic blocking in dilanthanide complexes bridged by the multi-electron redox-active ligand 2,3,5,6-tetra(2-pyridyl)pyrazine

Meta-Atom Behavior in Clusters Revealing Large Spin Ground States

“…The maximum in χ M ″ vs ν occurs in a narrow temperature range (3.4 to 6.6 K) and is consistent with the sharp maximum observed in the ZFC data. 24a Alternatively, the relaxation behavior can also be observed by a peak maximum in the χ M ″ vs T plot (Figure 4b). Additionally, Cole–Cole plots ( χ M ″ vs χ M ′) displaying semicircular profiles, as is the case for 2 as illustrated in Figure 4d, indicate that a single relaxation pathway is operative.…”

Radical ligand-containing single-molecule magnets

“…Specifically, owing to its bridging capability and propensity to accept multiple electrons, tetra-2-pyridinylpyrazine (tppz) was employed in the synthesis of the complexes [(Cp* 2 Ln) 2 (-tppz • )] + (39-Ln; Ln = Gd, Tb, Dy) and [(Cp* 2 Ln) 2 (-tppz • )] − (40-Ln; Ln = Gd, Tb, Dy), which contain bridging monoand trianionic radicals, tppz 3−• and tppz 3−• , respectively [288]. The coupling constant of J Gd-L = −6.91(4) cm −1 observed for 39-Gd is smaller than those of the bpym •− and N 2 3−• radical-bridged complexes, which is expected given the larger region over which the electron is delocalized.…”

Neodymium(III) Complexes Capable of Multi‐Electron Redox Chemistry

“…While redox-active ligands have been proven to impart interesting magnetic [8,9] or electrochemical [10][11][12] properties to the rare earth elements due to their ability to stabilize ligand radicals, [13,14] fewer examples exist that demonstrate productive electron movement for new bond formation. Mazzanti et al reported tetradentate Schiff base complexes of Nd, Eu, Tb,Ybthat, upon reduction, store two electrons in anew CÀC s bond.…”