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Science 3 December 1993:
Vol. 262. no. 5139, pp. 1554 - 1557
DOI: 10.1126/science.262.5139.1554
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Articles

High-Tc Molecular-Based Magnets: Ferrimagnetic Mixed-Valence Chromium(III)-Chromium(II) Cyanides with Tc at 240 and 190 Kelvin

T. Mallah 1, S. Thiébaut 1, M. Verdaguer 1, and P. Veillet 2

1 Laboratoire de Chimie des Métaux de Transition, U.A. Centre National de la Recherche Scientifique 419, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris, France
2 Institut d'Electronique Fondamentale, U.A. Centre National de la Recherche Scientifique 22, Université de Paris Sud, 91405 Orsay, France

Molecular-based magnets with high magnetic-ordering temperatures, Tc, can be obtained by mild chemistry methods by focusing on the bimetallic and mixed-valence transition metal µ-cyanide of the Prussian blue family. A simple orbital model was used to predict the electronic structure of the metal ions required to achieve a high ordering temperature. The synthesis and magnetic properties of two compounds, [Cr5(CN)12].10H2O and Cs0.75 [Cr2.125(CN)6]·5H2O, which exhibited magnetic-ordering temperatures of 240 and 190 kelvin, respectively, are reported, together with the strategy for further work.

Submitted on July 12, 1993
Accepted on September 20, 1993


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Mixed valency and magnetism in cyanometallates and Prussian blue analogues.
J.M Herrera, A Bachschmidt, F Villain, A Bleuzen, V Marvaud, W Wernsdorfer, and M Verdaguer (2008)
Phil Trans R Soc A 366, 127-138
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High-Temperature Molecular Magnets Based on Cyanovanadate Building Blocks: Spontaneous Magnetization at 230 K.
W. R. Entley and G. S. Girolami (1995)
Science 268, 397-400
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