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Science 27 July 1990:
Vol. 249. no. 4967, pp. 401 - 403
DOI: 10.1126/science.249.4967.401
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Articles

A Molecular Ferromagnet with a Curie Temperature of 6.2 Kelvin: [Mn(C5(CH3)5)2]+[TCNQ]-

W. E. Broderick 1, J. A. Thompson 1, E. P. Day 2, and B. M. Hoffman 1

1 Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208
2 Gray Freshwater Biological Institute, University of Minnesota, Navarre, MN 55392

The study of magnetic phase transitions in insulating molecular solids provides new insights into mechanisms of magnetic coupling in the solid state and into critical phenomena associated with these transitions. Only a few such materials are known to display cooperative magnetic properties. The use of high-spin molecular components would enhance intermolecular spin-spin interactions and thus a series of chargetransfer (CT) salts have been synthesized that utilize the spin S = 1 molecular cation, [Mn(C5(CH3)5)2]+ (decamethylmanganocenium). The structure and cooperative magnetic behavior of [Mn(C5(CH3)5)2]+[TCNQ- (decamethylmanganocenium 7,7,8,8-tetracyano-p-quinodimethanide) are reported. This salt is a bulk molecular ferromagnet with the highest critical (Curie) temperature (Tc = 6.2 K) and coercive field (3.6 x 103 gauss), yet reported for such a material.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
A Molecular-Based Magnet with a Fully Interlocked Three-Dimensional Structure.
H. O. Stumpf, Y. Pei, O. Kahn, L. Ouahab, and D. Grandjean (1993)
Science 261, 447-449
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Organic Molecular Soft Ferromagnetism in a Fullerene C60.
P.-M. ALLEMAND, K. C. KHEMANI, A. KOCH, F. WUDL, K. HOLCZER, S. DONOVAN, G. GRUNER, and J. D. THOMPSON (1991)
Science 253, 301-302
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Science. ISSN 0036-8075 (print), 1095-9203 (online)