Magnetic chains of Fe3 clusters in the {Fe3YO2} butterfly molecular compound
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RUBIN, J., BADIA-ROMANO, Laura, LUIS, Fernando, MERIAKRE, V., PRODIUS, Denis, ARAUZO, A., BARTOLOME, Fernando, BARTOLOME, Juan. Magnetic chains of Fe3 clusters in the {Fe3YO2} butterfly molecular compound. In: Dalton Transactions, 2020, nr. 9(49), pp. 2979-2988. ISSN 1477-9226. DOI: https://doi.org/10.1039/c9dt04816b
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Dalton Transactions
Numărul 9(49) / 2020 / ISSN 1477-9226 /ISSNe 1477-9234

Magnetic chains of Fe3 clusters in the {Fe3YO2} butterfly molecular compound
DOI:https://doi.org/10.1039/c9dt04816b

Pag. 2979-2988

Rubin J.1, Badia-Romano Laura1, Luis Fernando1, Meriakre V.2, Prodius Denis2, Arauzo A.1, Bartolome Fernando1, Bartolome Juan1
 
1 Universidad de Zaragoza,
2 Institute of Chemistry
 
 
Disponibil în IBN: 6 aprilie 2020
Rezumat

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 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. 
Cuvinte-cheie
activation energy, Antiferromagnetic materials, Antiferromagnetism, crystal structure, magnetic susceptibility, Molecules, Rare earths, specific heat

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<cfAbstr cfLangCode='EN' cfTrans='o'><p>The &quot;butterfly&quot; molecule [Fe<sub>3</sub>Y(&mu;3-O)<sub>2</sub>(CCl<sub>3</sub>COO)<sub>8</sub>(H<sub>2</sub>O)(THF)<sub>3</sub>] (in brief {Fe<sub>3</sub>YO<sub>2</sub>}) includes three Fe<sup>3+</sup>&nbsp;ions which build&nbsp;a&nbsp;robust Fe<sub>3</sub>&nbsp;cluster with&nbsp;a&nbsp;strong intracluster antiferromagnetic exchange and&nbsp;a&nbsp;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&nbsp;a&nbsp;sizeable magnetic anisotropy pointing to the existence of intercluster interactions. However, no phase transition to&nbsp;a&nbsp;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/k<sub>B</sub>&nbsp;= -40(2) mK between Fe<sub>3</sub>&nbsp;cluster spins, and&nbsp;a&nbsp;uniaxial anisotropy with parameter D/k<sub>B</sub>&nbsp;= -0.56(3) K. This is associated to single chains of Fe<sub>3</sub>&nbsp;clusters oriented along the shortest intercluster distances displayed by the crystal structure of {Fe<sub>3</sub>YO<sub>2</sub>}. Ac susceptibility measurements reveal that the magnetic relaxation is dominated by&nbsp;a&nbsp;quantum tunnelling process below 0.2 K, and by thermally activated processes above this temperature. The experimental activation energy of this single chain magnet, E<sub>a</sub>/k<sub>B</sub>&nbsp;= 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.&nbsp;</p></cfAbstr>
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