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Type: Artigo de periódico
Title: Electrical And Magnetic Properties Of New Compounds Of The Conductor Anion [ni(dmit)2]- And Nitronyl Nitroxide Magnetic Radicals [propriedades Elétricas E Magnéticas De Novos Compostos Com O ânion Condutor [ni(dmit)2]- E Radicais Magnéticos Nitronil Nitróxido]
Author: Dias M.C.
Stumpf H.O.
Sansiviero M.T.C.
Pernaut J.M.
Matencio T.
Knobel M.
Cangussu D.
Abstract: Three compounds have been synthesized with formulae [3-MeRad][Ni(dmit) 2] (1), [4-MeRad][Ni(dmit)2] (2) and [4-PrRad][Ni(dmit) 2] (3) where [Ni(dmit)2]- is an anionic π-radical (dmit = 1,3-dithiol-2-thione-4,5-dithiolate) and [3-MeRad] + is 3-N-methylpyridinium α-nitronyl nitroxide, [4-MeRad] + is 4-N-methylpyridinium α-nitronyl nitroxide and [4-PrRad]+ is 4-N-propylpyridinium α-nitronyl nitroxide. The temperature-dependent magnetic susceptibility of 1 revealed that an antiferromagnetic interaction operates between the 3-MeRad+ radical cations with exchange coupling constants of J1 = - 1.72 cm -1 and antiferromagnetism assigned to the spin ladder chains of the Ni(dmit)2 radical anions. Compound 1 exhibits semiconducting behavior and 3 presents capacitor behavior in the temperature range studied (4 - 300 K).
Rights: aberto
Identifier DOI: 
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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