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Article Dans Une Revue Dalton Transactions Année : 2023

Slow magnetic relaxation in a homoaxially phosphine oxide coordinated pentagonal bipyramidal Dy( iii ) complex

Résumé

We report the synthesis of [(L)DyIII(Cy3PO)2]·[BPh4] (1-Dy) (where H2L = 2,6-diacetylpyridine bis-benzoylhydrazone and Cy = cyclohexyl) which crystallized in the triclinic, P[1 with combining macron] space group. The local geometry around Dy(III) in 1-Dy was found to be pentagonal bipyramidal (pseudo-D5h). The AC magnetic susceptibility measurements performed on 1-Dy and on its diluted 1-Y(Dy) samples showed a typical single-molecule magnet signature revealed by the appearance of AC-frequency dependent out-of-phase susceptibility signals in the absence of a static magnetic field. The out-of-phase AC susceptibility signals were well resolved on the application of a small magnetic field (HDC = 500 Oe) and yielded an energy barrier for magnetization flipping of Ueff/kB = 50 K for the diluted derivative. The magnetic studies on 1-Dy and 1-Y(Dy) and data analysis further confirm that Raman and QTM under-barrier magnetic relaxations play a crucial role in lowering Ueff despite the almost axial nature of the Dy(III) ion in 1-Dy. We have rationalized these observations through detailed ab initio calculations performed on the X-ray crystal structure of 1-Dy.
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Dates et versions

hal-04016194 , version 1 (06-03-2023)

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Pankaj Kalita, Naushad Ahmed, Shruti Moorthy, Virginie Béreau, Arun Kumar Bar, et al.. Slow magnetic relaxation in a homoaxially phosphine oxide coordinated pentagonal bipyramidal Dy( iii ) complex. Dalton Transactions, 2023, 52 (9), pp.2804-2815. ⟨10.1039/D2DT03789K⟩. ⟨hal-04016194⟩
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