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Molecular Science
Vol. 6 (2012) No. 1 p. A0049-

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http://doi.org/10.3175/molsci.6.A0049

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A genuine organic coexisting system of magnetism and conductivity has been realized. For this purpose, organic donor molecules carrying stable radicals in a cross-π-conjugated manner, so called “Spin-Polarized Donors”, have been developed. Among them, ESBN, consisting of a benzo-annulated selenium-containing TTF skeleton and a nitronylnitroxide moiety, was synthesized and its ionradical salt, (ESBN)2ClO4, was obtained by the electrochemical oxidation of ESBN. The interaction between conduction electrons in the mixed-valence π-staking column of donor moieties and localized spins in the radical moieties in this salt was confirmed by the appearance of giant negative magnetoresistance (–70% at 2 K, 9 T). The spin-dependent electron transport in this system is derived from the intramolecular magnetic coupling by means of orthogonality of molecular orbitals.

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