J. Phys. IV France
Volume 114, April 2004
Page(s) 533 - 535

J. Phys. IV France
114 (2004) 533
DOI: 10.1051/jp4:2004114126

Development of new magnetic organic conductors based on donor molecules with stable organic radical part

H.-J. Lee1, H.-B. Cui1, H. Fujiwara1, H. Kobayashi1, 1, E. Fujiwara2 and A. Kobayashi2

1  Institute for Molecular Science and CREST, JST, Myodaiji, Okazaki 444-8585, Japan
2  Research Centre for Spectrochemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

A series of new magnetic organic conductors consisting of $\pi $ donors with stable organic radical part and inorganic anions was prepared. The air-stable TTP derivatives containing a PROXYL radical were synthesized by phosphite-based cross-coupling reaction of 1,3-dithiol-2-one derivatives and the thione containing a PROXYL radical. The ClO 4 and FeCl 4 salts of TTP-PROXYL were electrochemically prepared. Besides the 2:1 salts with fairly high conductivity (D 2A; D=radical donor, A= anion), there is a semiconducting 1:1 complex (TTP-PROXYL)FeCl 4 ( $\sigma $(RT) = 10 $^{-3} \quad \Omega ^{-1}$cm -1, Ea = 0.12 eV). The temperature dependence of the susceptibilities suggests the coexistence of n-radical spins (S=1/2) and Fe 3+ magnetic moments (S=5/2). The system with non-magnetic ions, (TTP-PROXYL) GaCl 4 and (CpTTP-PROXYL)AsF 6 salts were also examined. Key words. magnetic organic conductors, electrochemical method.

© EDP Sciences 2004