Journal Article

PreJuSER-10156

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structure-related frustrated magnetism of nonosized polyoxometalates: aesthetics and properties in harmony

Kögerler, P.FZJ* ; Tsukerblat, B. ; Müller, A.

2010
Soc. London

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Please use a persistent id in citations: doi:10.1039/b910716a

Abstract: The structural versatility characterizing polyoxometalate chemistry, in combination with the option to deliberately use well-defined building blocks, serves as the foundation for the generation of a large family of magnetic clusters, frequently comprising highly symmetric spin arrays. If the spin centers are coupled by antiferromagnetic exchange, some of these systems exhibit spin frustration, which can result in novel magnetic properties of purely molecular origins. We discuss here the magnetic properties of selected nanosized polyoxometalate clusters featuring spin triangles as their magnetic 'building blocks' or fragments. This includes unique porous Keplerate clusters of the type {(Mo)Mo(5)}(12)M(30) (M = Fe(III), Cr(III), V(IV)) with the spin centers defining a regular icosidodecahedron and the {V(15)As(6)}-type cluster sphere containing a single equilateral spin triangle; these species are widely discussed and studied in the literature for their role in materials science as molecular representations of Kagomé lattices and in relation to quantum computing, respectively. Exhibiting fascinating and unique structural features, these magnetic molecules allow the study of the implications of frustrated spin ordering. Furthermore, this perspective covers the impact of spin frustration on the degeneracy of the ground state and related problems, namely strong magnetic anisotropy and the interplay of antisymmetric exchange and structural Jahn-Teller effects.

Keyword(s): Magnetics (MeSH) ; Models, Molecular (MeSH) ; Molecular Structure (MeSH) ; Nanostructures: chemistry (MeSH) ; Quantum Theory (MeSH) ; Tungsten Compounds: chemistry (MeSH) ; Tungsten Compounds ; polyoxometalate I ; J

Note: The authors are indebted to Marshall Luban (Iowa State University) and Dante Gatteschi (University of Florence) for numerous helpful discussions and comments. A. M. gratefully acknowledges financial support by the Deutsche Forschungsgemeinschaft, the Fonds der Chemischen Industrie, the European Union, and the Volkswagenstiftung. B. T. and A. M. thank the German-Israeli Foundation (GIF) for Scientific Research & Development (grant G-775-19.10/2003) for financial support. BT thanks the Israel Science Foundation for financial support (grant 168/09).

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Contributing Institute(s):

1. Elektronische Eigenschaften (IFF-9)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2010

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