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Construction of an Artificial Ferrimagnetic Lattice by Lithium Ion Insertion into a Neutral Donor/Acceptor Metal–Organic Framework

Abstract

Construction of a molecular system in which the magnetic lattice exhibits long‐range order is one of the fundamental goals in materials science. In this study, we demonstrate the artificial construction of a ferrimagnetic lattice by doping electrons into acceptor sites of a neutral donor/acceptor metal–organic framework (D/A‐MOF). This doping was achieved by the insertion of Li‐ions into the D/A‐MOF, which was used as the cathode of a Li‐ion battery cell. The neutral D/A‐MOF is a layered system composed of a carboxylate‐bridged paddlewheel‐type diruthenium(II,II) complex as the donor and a TCNQ derivative as the acceptor. The ground state of the neutral form was a magnetically disordered paramagnetic state. Upon discharge of the cell, spontaneous magnetization was induced; the transition temperature was variable. The stability of the magnetically ordered lattice depended on the equilibrium electric potential of the D/A‐MOF cathode, which reflected the electron‐filling level.

Ein Gitter mit ferrimagnetischer Ordnung wurde durch Elektronendotierung mittels Lithiumioneninsertion ausgehend von dem magnetisch ungeordneten Grundzustand eines neutralen Metall‐organischen Donor‐Akzeptor‐Gerüsts (D/A‐MOF) erzeugt. Wie stabil das magnetisch geordnete Gitter ist, hängt vom Gleichgewichtspotential der D/A‐MOF‐Kathode ab. Die Ergebnisse deuten eine neue Designstrategie für molekülbasierte Magnete an.

Authors:   Kouji Taniguchi, Keisuke Narushima, Julien Mahin, Wataru Kosaka, Hitoshi Miyasaka
Journal:   Angewandte Chemie
Year:   2016
Pages:   n/a
DOI:   10.1002/ange.201601672
Publication date:   15-Mar-2016
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