title: Strong exchange and magnetic blocking in N₂³⁻-radical-bridged lanthanide complexes.
abstract: Single-molecule magnets approach the ultimate size limit for spin-based devices. These complexes can retain spin information over long periods of time at low temperature, suggesting possible applications in high-density information storage, quantum computing and spintronics. Notably, the success of most such applications hinges upon raising the inherent molecular spin-inversion barrier. Although recent advances have shown the viability of lanthanide-containing complexes in generating large barriers, weak or non-existent magnetic exchange coupling allows fast relaxation pathways that mitigate the full potential of these species. Here, we show that the diffuse spin of an N(2)(3-) radical bridge can lead to exceptionally strong magnetic exchange in dinuclear Ln(III) (Ln = Gd, Dy) complexes. The Gd(III) congener exhibits the strongest magnetic coupling yet observed for that ion, while incorporation of the high-anisotropy Dy(III) ion gives rise to a molecule with a record magnetic blocking temperature of 8.3 K at a sweep rate of 0.08 T s(-1).
authors.affiliation: Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
authors.forename: Jeffrey D
authors.initials: JD
authors.lastname: Rinehart
authors.forename: Ming
authors.initials: M
authors.lastname: Fang
authors.forename: William J
authors.initials: WJ
authors.lastname: Evans
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Long
mesh_terms: D018360:Crystallography, X-Ray; D005682:Gadolinium / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008280:Magnetics; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry
chemical_list: D028581:Lanthanoid Series Elements; D009942:Organometallic Compounds; D005682:Gadolinium