chem.202001235.pdf (897.65 kB)
Probing Relaxation Dynamics in Five-Coordinate Dysprosium Single-Molecule Magnets
journal contributionposted on 2021-05-13, 08:44 authored by Vijay S Parmar, Fabrizio Ortu, Xiaozhou Ma, Nicholas F Chilton, Rodolphe Clerac, David P Mills, Richard EP Winpenny
A new family of five-coordinate lanthanide single-molecule magnets (Ln SMMs) [Dy(Mes*O)2(THF)2X] (Mes*=2,4,6-tri-tert-butylphenyl; X=Cl, 1; Br, 2; I, 3) is reported with energy barriers to magnetic reversal >1200 K. The five-coordinate DyIII ions have distorted square pyramidal geometries, with halide anions on the apex, and two Mes*O ligands mutually trans- to each other, and the two THF molecules forming the second trans- pair. These geometrical features lead to a large magnetic anisotropy in these complexes along the trans-Mes*O direction. QTM and Raman relaxation times are enhanced by varying the apex halide from Cl to Br to I, or by dilution in a diamagnetic yttrium analogue.
Engineering and Physical Sciences Research Council. Grant Numbers: EP/P002560/1, EP/R011079/1, EP/P001386/1 European Research Council. Grant Number: ERC-2017-ADG-786734 Chinese Government Scholarship. Grant Number: PhD studentship
CitationV. S. Parmar, F. Ortu, X. Ma, N. F. Chilton, R. Clérac, D. P. Mills, R. E. P. Winpenny, Chem. Eur. J. 2020, 26, 7774.
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