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Article Abstract
Exchange coupling is essential in defining the magnetic behavior of polymetallic lanthanide-based (Ln) single-molecule magnets (SMMs), where, thanks to the unpaired electron(s), radical ligands show promise as magnetic bridges between the paramagnetic metal centers. Combining high-performance lanthanide metallocene [Cp*₂Ln] (Cp* = pentamethylcyclopentadienyl) units with the 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine radical ligand (bmtz) yielded two new radical-bridged dinuclear lanthanide metallocenes, [(Cp*₂Ln)₂(bmtz)](BPh)·Solvent (Ln = Gd (1), Solvent = THF; Dy (2), Solvent = toluene). The strong magnetic exchange coupling of J = -12.6 cm observed in 1, was probed via SQUID magnetometry as well as computational studies. This, combined with the highly anisotropic Dy ions in 2, leads to zero-field SMM behavior and slow magnetic relaxation through thermally activated processes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12271994 | PMC |
| http://dx.doi.org/10.1002/chem.202501542 | DOI Listing |
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