Slow magnetic relaxation of Ln(III)-nitronyl nitroxide radical complexes with shortest non-covalent O⋯O contacts

Slow relaxation of magnetization has been studied for a series of stable isomorphic 3D‐polynuclear Ln‐Co complexes comprising hexadentate [Co(CN)6]3– linkers, namely {[Ln(H2O)2][Co(CN)6]·2H2O}n where Ln = Tb (1), Dy (2), Er (3) and Yb (4). While 1 and 4 behave as field‐induced single‐ion magnets (SIMs), compounds 2 and 3 undergo rapid demagnetization even under magnetic fields up to 5000 Oe. The effective anisotropic energy barrier of 4 was estimated as 63 K (5000 Oe) which, to the best of our knowledge, is the highest value among Yb‐based SIMs. The obtained data are discussed in scope of the configuration of the Ln environment, i.e. accounting its composition and geometry as well as mutual arrangement of chemically unequal donating centers. Thus, the studied series of complexes represents very rare case when SIM performance of non‐dysprosium complexes far surpasses that of isomorphic Dy derivative.

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Unexpected Supremacy of Non‐Dysprosium Single‐Ion Magnets within a Series of Isomorphic Lanthanide Cyanocobaltate(III) Complexes

Babeshkin

Гавриков

Petrosyants

et al. 2020

Eur J Inorg Chem

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Magnetic slow relaxation of Tb(III) complex with a nitronyl nitroxide involving a brominated-pyridyl substituent

Shi

Wang

et al. 2021

Journal of Molecular Structure

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Slow magnetic relaxation of Ln(III)-nitronyl nitroxide radical complexes with shortest non-covalent O⋯O contacts

Cited by 2 publications

References 50 publications

Unexpected Supremacy of Non‐Dysprosium Single‐Ion Magnets within a Series of Isomorphic Lanthanide Cyanocobaltate(III) Complexes

Unexpected Supremacy of Non‐Dysprosium Single‐Ion Magnets within a Series of Isomorphic Lanthanide Cyanocobaltate(III) Complexes

Magnetic slow relaxation of Tb(III) complex with a nitronyl nitroxide involving a brominated-pyridyl substituent

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