Single molecule magnet with an unpaired electron trapped between two lanthanide ions inside a fullerene

Fupin Liu, Denis S. Krylov, Lukas Spree, Stanislav M. Avdoshenko, Nataliya A. Samoylova, Marco Rosenkranz, Aram Kostanyan, Thomas Greber, Anja U. B. Wolter, Bernd Büchner and Alexey A. Popov ()
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Fupin Liu: Leibniz Institute for Solid State and Materials Research
Denis S. Krylov: Leibniz Institute for Solid State and Materials Research
Lukas Spree: Leibniz Institute for Solid State and Materials Research
Stanislav M. Avdoshenko: Leibniz Institute for Solid State and Materials Research
Nataliya A. Samoylova: Leibniz Institute for Solid State and Materials Research
Marco Rosenkranz: Leibniz Institute for Solid State and Materials Research
Aram Kostanyan: Physik-Institut der Universität Zürich
Thomas Greber: Physik-Institut der Universität Zürich
Anja U. B. Wolter: Leibniz Institute for Solid State and Materials Research
Bernd Büchner: Leibniz Institute for Solid State and Materials Research
Alexey A. Popov: Leibniz Institute for Solid State and Materials Research

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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 Y2@C80 and Dy2@C80 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 Dy2@C80(CH2Ph) with a record-high 100 s blocking temperature of 18 K. All magnetic moments in Dy2@C80(CH2Ph) are parallel and couple ferromagnetically to form a single spin unit of 21 μB 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.

Date: 2017
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DOI: 10.1038/ncomms16098

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