J. Phys. IV France 114 (2004) 561
Strong -d interaction based on brominated TTF-type donor EDT-TTFBr 2J. Nishijo1, 1, A. Miyazaki1, T. Enoki1, 1, R. Watanabe2, Y. Kuwatani2 and M. Iyoda2
1 Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
2 Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
New - d interacting system based on brominated TTF-type donor EDT-TTFBr 2 (= 4,5-dibromo-4 ,5 -ethylenedithiotetrathiafulvalene) was investigated. Magnetic (EDT-TTFBr 2)2FeBr 4 and non-magnetic (EDT-TTFBr 2)2GaBr 4 are isostructural salts, which have strong anion-donor interaction through Br-Br atomic contacts with weak direct anion-anion interaction. The iron salt takes an antiferromagnetic transition at TN = 11 K owing to strong - d interaction, which originates from the strong anion-donor interaction. The strong - d interaction also plays an important role in the electron transport phenomenon in the variation of temperature and applied magnetic field. Key words. - d interaction - negative magnetoresistance - organic magnetic conductor.
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