Anisotropy of CoII transferred to the Cr7Co polymetallic cluster via strong exchange interactions

Elena Garlatti; Tatiana Guidi; Alessandro Chiesa; Simon Ansbro; Michael L. Baker; Jacques Ollivier; Hannu Mutka; Grigore A. Timco; Inigo Vitorica-Yrezabal; Eva Pavarini; Paolo Santini; Giuseppe Amoretti; Richard E. P. Winpenny; Stefano Carretta

doi:10.1039/C8SC00163D

Anisotropy of Co^II transferred to the Cr₇Co polymetallic cluster via strong exchange interactions†

Elena Garlatti,

‡^a Tatiana Guidi,

‡^b Alessandro Chiesa,‡^ac Simon Ansbro,‡^de Michael L. Baker,‡^f Jacques Ollivier,‡^e Hannu Mutka,‡^e Grigore A. Timco,

‡^d Inigo Vitorica-Yrezabal,‡^d Eva Pavarini,‡^cg Paolo Santini,‡^a Giuseppe Amoretti,‡^a Richard E. P. Winpenny

‡^d and Stefano Carretta

‡*^a

Author affiliations

* Corresponding authors

^a Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
E-mail: stefano.carretta@unipr.it

^b ISIS Facility, Rutherford Appleton Laboratory, OX11 0QX Didcot, UK

^c Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany

^d The School of Chemistry, Photon Science Institute, The University of Manchester, M13 9PL Manchester, UK

^e Institut Laue-Langevin, 71 Avenue des Martyrs CS 20156, Grenoble Cedex 9 F-38042, France

^f The School of Chemistry, The University of Manchester at Harwell, Didcot, UK

^g JARA High-Performance Computing, RWTH Aachen University, 52062 Aachen, Germany

Abstract

The Cr₇Co ring represents a model system to understand how the anisotropy of a Co^II ion is transferred to the effective anisotropy of a polymetallic cluster by strong exchange interactions. Combining sizeable anisotropy with exchange interactions is an important point in the understanding and design of new anisotropic molecular nanomagnets addressing fundamental and applicative issues. By combining electron paramagnetic resonance and inelastic neutron scattering measurements with spin Hamiltonian and ab initio calculations, we have investigated in detail the anisotropy of the Co^II ion embedded in the antiferromagnetic ring. Our results demonstrate a strong and anisotropic exchange interaction between the Co and the neighbouring Cr ions, which effectively transmits the anisotropy to the whole molecule.

This article is part of the themed collection: In memory of Paul O’Brien

Chemical Science

Anisotropy of Co^II transferred to the Cr₇Co polymetallic cluster via strong exchange interactions†

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Anisotropy of Co^II transferred to the Cr₇Co polymetallic cluster via strong exchange interactions

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