Alkali Metal Based Triimidosulfite Cages as Versatile Precursors for Single-Molecule Magnets |
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| Authors: | Daniel Lüert Dr. Christina M. Legendre Dr. Regine Herbst-Irmer Prof. Dr. Dietmar Stalke |
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| Affiliation: | Institut für Anorganische Chemie, Georg-August-University Göttingen, Tammannstraße 4, 37077 Göttingen, Germany |
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| Abstract: | ![]()
Based on the potassium [{S(tBuN)2(tBuNH)}2K3(tmeda)-K3{(HNtBu)(NtBu)2S}2] ( 1 ) and sodium precursors [S(tBuN)3(thf)3-Na3SNa3(thf)3(NtBu)3S] ( 2 ), [S(tBuN)3(thf)3Na3{(HNtBu)(NtBu)2S}] ( 3 ) and [(tmeda)3S-{Na3(NtBu)3S}2] ( 4 ) the syntheses and magnetic properties of three mixed metal triimidosulfite based alkali-lanthanide-metal-cages [(tBuNH)Dy{K(0.5tmeda)}2{(NtBu)3S}2]n ( 5 ) and [ClLn{Na(thf)}2{(NtBu)3S}2] 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 DyIII-complexes 5 and 6 display slow relaxation of magnetization at zero field, with relaxation barriers U=77.0 cm−1 for 5 , 512.9 and 316.3 cm−1 for 6 , respectively. Significantly, the latter complex 6 also exhibits a butterfly-shaped hysteresis up to 7 K. |
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| Keywords: | SMM sodium sulfur-nitrogen ligands triimidosulfite X-ray diffraction |
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