Azide-Coordination in Homometallic Dinuclear Lanthanide(III) Complexes Containing Nonequivalent Lanthanide Metal Ions: Zero-Field SMM Behavior in the Dysprosium Analogue
Résumé
A series of homometallic dinuclear lanthanide complexes containing nonequivalent lanthanide metal centers [Ln(LH)(LH)(CHOH)(N)]MeOHHO [, Ln = Dy, = 0, = 2; , Ln = Tb, = 1, = 1] have been synthesized [LH = 6-((bis(2-hydroxyethyl)amino)-'-(2-hydroxybenzylidene)picolinohydrazide] and characterized. The dinuclear assembly contains two different types of nine-coordinated lanthanide centers, because the nonequivalent binding of the azide co-ligand as well as the varying coordination of the deprotonated Schiff base ligand. Detailed magnetic studies have been performed on the complexes and . Complex and its diluted analogue () are zero-field SMMs with effective energy barriers () of magnetization reversal equal to 59(3) K and 66(3) K and relaxation times of τ = 10(4) × 10 s and 10(4) × 10 s, respectively. On the other hand, complex shows a field-induced SMM behavior. Combined and density functional theory calculations were performed to explain the experimental findings and to unravel the nature of the magnetic anisotropy, exchange-coupled spectra, and magnetic exchange interactions between the two lanthanide centers.
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Kumar et al - 2021 - Azide-Coordination in Homometallic Dinuclear Lanthanide.pdf (2.92 Mo)
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Kumar_ic1c00249_si_001.pdf (2.79 Mo)
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