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Title: Single molecule magnet with an unpaired electron trapped between two lanthanide ions inside a fullerene
Authors: Liu, F.Krylov, D.S.Spree, L.Avdoshenko, S.M.Samoylova, N.A.Rosenkranz, M.Kostanyan, A.Greber, T.Wolter, A.U.B.Büchner, B.Popov, A.A.
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Issue Date: 2017
Published in: Nature Communications Vol. 8 (2017), No.
Publisher: London : Nature Publishing Group
Abstract: Increasing the temperature at which molecules behave as single-molecule magnets is a serious challenge in molecular magnetism. One of the ways to address this problem is to create the molecules with strongly coupled lanthanide ions. In this work, endohedral metallofullerenes Y 2 @C 80 and Dy 2 @C 80 are obtained in the form of air-stable benzyl monoadducts. Both feature an unpaired electron trapped between metal ions, thus forming a single-electron metal-metal bond. Giant exchange interactions between lanthanide ions and the unpaired electron result in single-molecule magnetism of Dy 2 @C 80 (CH 2 Ph) with a record-high 100 s blocking temperature of 18 K. All magnetic moments in Dy 2 @C 80 (CH 2 Ph) are parallel and couple ferromagnetically to form a single spin unit of 21 μ B with a dysprosium-electron exchange constant of 32 cm -1. The barrier of the magnetization reversal of 613 K is assigned to the state in which the spin of one Dy centre is flipped.
Keywords: fullerene; lanthanide; electron; fullerene; fundamental particle; ion; magnetization; metal; molecular analysis; rare earth element; Article; chemical bond; chemical interaction; chemical reaction; crystal structure; density functional theory; electrochemical analysis; electron; electron spin resonance; ferromagnetic coupling; hysteresis; low temperature; magnetic field; magnetism; magnetometry; matrix-assisted laser desorption-ionization mass spectrometry; molecule; particle size; room temperature; synthesis; X ray diffraction
DDC: 530
License: CC BY 4.0 Unported
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Appears in Collections:Physik

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