Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Bio- and Molecular Magnetism

MA 20.9: Vortrag

Dienstag, 21. März 2017, 11:45–12:00, HSZ 301

Recent development of endohedral metallofullerenes for single molecule magnetism — •Alexey Popov¹, Denis Krylov¹, Fupin Liu¹, Lukas Spree¹, Stanislav Avdoshenko¹, Aram Kostanyan², and Thomas Greber² — ¹Nanoscale Chemistry, Leibniz Institute for Solid State and Materials Research (IFW Dresden),Helmholtzstrasse 20 01069, Dresden, Germany — ²Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland

The molecules of endohedral metallofullerenes (EMFs) comprise the fullerene cage encapsulating metal ions (usually lanthanides). Metal atoms donate their valence electrons to the fullerene cage resulting in ionic environment, and Coulomb repulsion between metal atoms can be balanced by a presence of negatively charged non-metals. This results in a large magnetic anisotropy with quasi-uniaxial ligand field, which leads to the single molecule magnet (SMM) behaviour of lanthanide-based EMFs. When more than one lanthanide ion is encapsulated, the intracluster exchange and dipolar interactions have dramatic effect on the magnetic properties.

Here we will discuss the progress in the synthesis and magnetic properties of endohedral metallofullerenes. Different type of endohedral clusters (nitride, carbide, sulfide) as well as dimetallofullerenes will be considered and the influence of central non-metal atoms on magnetic anisotropy of lanthanides and intracluster exchange interaction will be analyzed. The route to EMF-SMMs with high blocking temperatures will be outlined.