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Magnetic chains of Fe3 clusters in the {Fe3YO2} butterfly molecular compound

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Abstract

The “butterfly” molecule [Fe3Y(μ3-O)2(CCl3COO)8(H2O)(THF)3] (in brief {Fe3YO2}) includes three Fe3+ ions which build a robust Fe3 cluster with a strong intracluster antiferromagnetic exchange Image ID:c9dt04816b-t1.gif and a total spin S = 5/2. It represents the starting magnetic system to study further interactions with magnetic rare earths when Y is replaced with lanthanides. We present heat capacity and equilibrium susceptibility measurements below 2 K, which show that each cluster has a sizeable magnetic anisotropy pointing to the existence of intercluster interactions. However, no phase transition to a long-range magnetically ordered phase is observed down to 20 mK. The intercluster interaction is analysed in the framework of the one-dimensional Blume–Capel model with an antiferromagnetic chain interaction constant J/kB = −40(2) mK between Fe3 cluster spins, and a uniaxial anisotropy with parameter D/kB = −0.56(3) K. This is associated to single chains of Fe3 clusters oriented along the shortest intercluster distances displayed by the crystal structure of {Fe3YO2}. Ac susceptibility measurements reveal that the magnetic relaxation is dominated by a quantum tunnelling process below 0.2 K, and by thermally activated processes above this temperature. The experimental activation energy of this single chain magnet, Ea/kB = 3.4(6) K, can be accounted for by the combination of contributions arising from single-molecule magnetic anisotropy and spin–spin correlations along the chains.

Graphical abstract: Magnetic chains of Fe3 clusters in the {Fe3YO2} butterfly molecular compound

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Supplementary files

Article information


Submitted
19 Dec 2019
Accepted
12 Feb 2020
First published
13 Feb 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Magnetic chains of Fe3 clusters in the {Fe3YO2} butterfly molecular compound

J. Rubín, L. Badía-Romano, F. Luis, V. Mereacre, D. Prodius, A. Arauzo, F. Bartolomé and J. Bartolomé, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04816B

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