Alkali Metal Based Triimidosulfite Cages As Versatile Precursors for Single-Molecule Magnets
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Based on the potassium [{S(tBuN) (tBuNH)} K (tmeda)-K {(HNtBu)(NtBu) S} ] (1) and sodium precursors [S(tBuN) (thf) -Na SNa (thf) (NtBu) S] (2), [S(tBuN) (thf) Na {(HNtBu)(NtBu) S}] (3) and [(tmeda) S-{Na (NtBu) S} ] (4) the syntheses and magnetic properties of three mixed metal triimidosulfite based alkali-lanthanide-metal-cages [(tBuNH)Dy{K(0.5tmeda)} {(NtBu) S} ] (5) and [ClLn{Na(thf)} {(NtBu) S} ] with Ln=Dy (6), Er (7) are reported. The corresponding potassium (1) and sodium (2-4) based cages are characterized through XRD and NMR experiments. Preventing lithium chloride co-complexation led to a significant increase of SMM performance to previously reported sulfur-nitrogen ligands. The subsequent Dy -complexes 5 and 6 display slow relaxation of magnetization at zero field, with relaxation barriers U=77.0 cm for 5, 512.9 and 316.3 cm for 6, respectively. Significantly, the latter complex 6 also exhibits a butterfly-shaped hysteresis up to 7 K.
Alkali Metal Based Triimidosulfite Cages as Versatile Precursors for Single-Molecule Magnets.
Luert D, Legendre C, Herbst-Irmer R, Stalke D Chemistry. 2022; 28(15):e202104470.
PMID: 35040528 PMC: 9304269. DOI: 10.1002/chem.202104470.