Abstract
Magnetic susceptibilities of 3-(4-chlorophenyl)-1,5-dimethyl-6-thioxoverdazyl ( p-CDTV) and 3-(4-bromophenyl)-6-thioxoverdazyl ( p-BDTV) radicals have been measured in the temperature range between 4.0 and 300 K. The susceptibility of p-CDTV follows the Curie—Weiss law with a Curie constant of 0.381 K emu/mol and a positive Weiss constant of θ = + 3.2 K, suggesting intermolecular ferromagnetic exchange interaction between neighboring radicals. On the other hand, the magnetic susceptibility of p-BDTV exhibits a broad maximum at 26.5 K. This susceptibility can be explained by the one-dimensional Heisenberg model with negative exchange interaction of 2 J/ k= −41.3 K.
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