Slow magnetic relaxation in distorted tetrahedral Dy(iii) aryloxide complexes

Abstract

Three distorted tetrahedral Dy(III) aryloxide complexes, [Na(THF)6][Dy(OArAd2tBu)2Cl2] (1) (OArAd2tBu = OC6H2Adamantyl2-2,6-tBu-4) and [Na(THF)6][Dy(OMes*)3X] (X = Cl, 2; BH4, 3), (OMes* = OC6H2tBu3-2,4,6) exhibit easy axis magnetic anisotropy and slow magnetic...

Low-Coordinate Erbium(III) Single-Molecule Magnets with Photochromic Behavior

“…The Er-O bond lengths in the case of the terminal erbium atoms are within the 2.056(5)-2.094(4) Å range, which is similar to the previous reports for lanthanide-aryloxide complexes. 26,27,33 Noteworthy, the analogous distances for the central erbium are slightly longer (2.095(5)-2.145(5) Å). Similar elongation can be observed for Er-N bonds: the terminal units show Er-N of 2.459(6)-2.461(5) while the central ones are longer 2.499(6)-2.519 (5).…”

Experimental and theoretical insights into Co–Ln magnetic exchange and the rare slow-magnetic relaxation behavior of [CoII2Pr]2+ in a series of linear [CoII2Ln]2+ complexes

“…Careful investigation of the main magnetization axis on Ln( iii ) in each of the complexes was directed toward μ 2 -O(phenoxo) oxygen donor atoms (having the highest charge density), which is consistent with the literature reports. 67,68 In all cases, the computed main magnetization axis on each of the cobalt( ii ) sites was almost perpendicular { g zz (Co1)–g zz (Ce1), 81.79°; g zz (Co2)– g zz (Ce1), 83.11° (for 2 ); g zz (Co1)– g zz (Pr1), 87.15°; g zz (Co2)– g zz (Pr1), 86.37° (for 3 ); g zz (Co1)– g zz (Tb1), 84.14°; g zz (Co2)– g zz (Pr1), 85.40° (for 5 ); g zz (Co1)– g zz (Pr1), 87.13°; g zz (Co2)–g zz (Dy1), 86.30° (for 6 )} to the orientation of the main magnetization axis ( g zz ) or spin projection on the lanthanide( iii ) site (Fig. 3 and Fig.…”

Synthesis of heteroleptic yttrium and dysprosium 1,2,4-tris(trimethylsilyl)cyclopentadienyl complexes

“…[Na(THF)6][Dy(OMes*)3(BH4)] (OMes* = {OC6H2 t Bu3-2,4,6}) shows slow magnetic relaxation at zero field but no barrier to magnetic reversal could be observed due to the presence of highly mixed low-lying excited mJ states. [59] The calculations show that the ground doublets for Dy(1), Dy(3) and Dy(4) are mainly composed of mJ = ±15/2 (98.9, 91 and 97%, respectively), however the ground doublet for Dy(2) is significantly mixed (Table S7); this also leads to fluctuations in the main magnetic axes of the centres (Figure 9). In all cases the first excited doublet is ≲ 100 cm -1 and there are significant variations in the energy of this state that correlates with the mixing of the ground state.…”