- آخرین فایل ها
- پرفروشترین فایل ها
- پربازدیدترین فایل ها
This paper was published on March 28, 2016, with the errors in Figure 4. The corrected version was reposted on April 1, 2016.
Dysprosium(III) single-ion magnets 1 and 2 exhibit slow magnetic relaxation with barrier heights (ΔE/kB) of 63.56 and 102.82 K under zero dc field as well as 118.50 and 164.55 K under 1200 Oe dc field, respectively. Compared with 1, guest molecules 1,4-dioxane produce an obvious effects on the magnetization dynamics in 2.
Two Dy(III) single-ion magnets with a trigonal dodecahedron (D2d) for 1 and an approximately square-antiprismatic (SAP, D4d) N2O6 coordination environment for 2, formulated as [Dy(Phen)(tfmb)3] (1) and [Dy(Phen)(tfmb)3]·0.5(1,4-dioxane) (2) (tfmb = 4,4,4-trifluoro-1-(4-methylphenyl)-1,3-butanedione, Phen = 1,10-phenanthroline), were obtained. Therein, complex 1 was transformed to 2 in 1,4-dioxane solution. Structural analysis shows that complexes 1 and 2 have differing local symmetry of Dy(III) ions. Magnetic studies indicate that the barrier heights (ΔE/kB) of 1 and 2 are 63.56 and 102.82 K under zero dc field as well as 118.50 and 164.55 K under 1200 Oe dc field, respectively. Based on the frequency dependencies of the ac susceptibilities, the effective barriers (ΔE/kB) and the pre-exponential factors (τ0) are 67.05 K and 4.57 × 10–6 s for 1 and 95.88 K and 2.39 × 10–7 s for 2 under zero dc field. The present work illustrates that guest-determined notable structure change results in different barrier heights.
|حجم فایل||1,9 KB|