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Issue 11, 2018
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Influence of lanthanides on spin-relaxation and spin-structure in a family of Fe7Ln4 single molecule magnets

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Abstract

A family of isostructural undecanuclear 3d–4f coordination clusters of formula [FeIII7LnIII4O4(OH)3(tea)2(Htea)3(Piv)7(H2O)2(NO3)3], where Ln = Y (1), Gd (2), Tb (3), Dy (4); PivH ≡ pivalic acid and H3tea ≡ triethanolamine, was synthesised. The central Fe7 core of the coordination cluster can be described in terms of two {Fe4O2} butterfly motifs sharing a common body Fe atom. The two Fe4 mean-planes subtend a dihedral angle of ca. 72°. The Tb (3) and Dy (4) compounds show Single Molecule Magnet (SMM) behaviour as confirmed by ac-susceptibility and μ-SQUID measurements. Furthermore, 57Fe Mössbauer spectra of 1–4 confirm the presence of high-spin FeIII sites. The spectra of all complexes in the high temperature range (30–300 K) show broad overlapping doublets which were assigned to the body and wing-tip pairs of metal ions within the Fe7 core. The low temperature Mössbauer spectra show dependence on the nature of the rare-earth metal as a result of its interaction with the iron sites. Thus, we observed a transition from fast (2), to intermediate (1) and very slow (frozen) (3, 4) spin fluctuation phenomena in these compounds.

Graphical abstract: Influence of lanthanides on spin-relaxation and spin-structure in a family of Fe7Ln4 single molecule magnets

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Supplementary files

Article information


Submitted
19 Jan 2018
Accepted
28 Feb 2018
First published
01 Mar 2018

J. Mater. Chem. C, 2018,6, 2862-2872
Article type
Paper
Author version available

Influence of lanthanides on spin-relaxation and spin-structure in a family of Fe7Ln4 single molecule magnets

D. Prodius, V. Mereacre, P. Singh, Y. Lan, S. Mameri, D. D. Johnson, W. Wernsdorfer, C. E. Anson and A. K. Powell, J. Mater. Chem. C, 2018, 6, 2862
DOI: 10.1039/C8TC00322J

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