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Science 23 July 1993:
Vol. 261. no. 5120, pp. 447 - 449
DOI: 10.1126/science.261.5120.447
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Articles

A Molecular-Based Magnet with a Fully Interlocked Three-Dimensional Structure

Humberto O. Stumpf 1, Yu Pei 1, Olivier Kahn 1, Lahcéne Ouahab 2, and Daniel Grandjean 2

1 Laboratoire de Chimie Inorganique, URA n° 420, Université de Paris Sud, 91405 Orsay, France
2 Laboratoire de Chimie du Solide Inorganique et Moléculaire, URA n° 1495, Université de Rennes 1, 35042 Rennes, France

A compound has been synthesized with the formula (rad)2Mn2[Cu(opba)]3(DMSO)2.2H2O, where rad+ is 2-(4-N-methylpyridinium)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, opba is orthophenylenebis(oxamato), and DMSO is dimethyl sulfoxide. It consists of two nearly perpendicular graphite-like networks with edge-sharing Mn(II)6Cu(II)6 hexagons. The two networks are fully interlocked with the same topological relationship as that between adjacent rings of a necklace. The compound has three kinds of spin carriers: Mn(II) and Cu(II) ions, antiferromagnetically coupled through oxamato bridges, and rad+ radical cations, bridging the Cu(II) ions through the nitronyl nitroxide groups and forming Cu-rad chains. The temperature dependence of the magnetization reveals that below 22.5 K, the compound behaves as a magnet.

Submitted on April 13, 1993
Accepted on June 3, 1993


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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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Spin Crossover in a Catenane Supramolecular System.
J. A. Real, E. Andres, M. C. Munoz, M. Julve, T. Granier, A. Bousseksou, and F. Varret (1995)
Science 268, 265-267
   Abstract »    PDF »
The Chemistry of Magnets.
P. Day (1993)
Science 261, 431-432
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