Abstract
The crystal structure and physical properties of radical ion salts (EDO-TTFBr2)2FeX4 (X = Cl, Br) composed of halogen-substituted organic donor and magnetic halide anions are investigated. The salts consist of uniformly stacked donor molecules, whose Br substituents are connected to halide ligands of anions with remarkably short intermolecular contacts. Both salts show metallic behavior above ca. 30K. The FeCl4 salt shows an antiferromagnetic (AF) transition at TN = 4.2K despite the absence of anion⋯anion contacts, thus the magnetic interaction between the localized spins on the anions is mediated by the π-d interaction through the Br⋯Cl contacts. For the FeBr4 salt the AF transition temperature is elevated to TN = 13.5K, accompanied with another anomaly at Tc2 = 8.5K. This behavior can be qualitatively explained by a magnetic structure model where the π-d interaction between donor and anion is taken into account.
Original language | English |
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Pages (from-to) | 545-547 |
Number of pages | 3 |
Journal | Journal De Physique. IV : JP |
Volume | 114 |
DOIs | |
State | Published - 2004 |
Event | ISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets - Port-Bourgenay, France Duration: 2003/09/21 → 2003/09/26 |
Keywords
- Molecular conductors
- Molecular magnets
- π-d interaction
ASJC Scopus subject areas
- General Physics and Astronomy