Electrical and magnetic properties of new compounds of the conductor anion [ni(dmit)2] and nitronyl nitroxide magnetic radicals
Mauro Cesar Dias, Humberto Osório Stumpf, Maria Terezinha Caruso Sansiviero, Jean Michel Pernaut, Tulio Matencio, Marcelo Knobel, Danielle Cangussu
ARTIGO
Inglês
[Propriedades elétricas e magnéticas de novos compostos com o ânion condutor [Ni(dmit)2]- e radicais magnéticos nitronil nitróxido]
Agradecimentos: Ao CNPq e a FAPEMIG pelo apoio financeiro que permitiu a execução dessa pesquisa; à Profa. M. Temperini – IQ- USP pelos espectros Raman; ao Prof. A. G. de Oliveira e ao Pós-DS R. Rubinger pelas medidas de condutividade em baixas temperaturas
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 pi-radical (dmit = 1,3-dithiol-2-thione-4,5-dithiolate) and [3-MeRad](+) is 3-N-methylpyridinium alpha-nitronyl...
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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 pi-radical (dmit = 1,3-dithiol-2-thione-4,5-dithiolate) and [3-MeRad](+) is 3-N-methylpyridinium alpha-nitronyl nitroxide, [4-MeRad](+) is 4-N-methylpyridinium alpha-nitronyl nitroxide and [4-PrRad](+) is 4-N-propylpyridinium alpha-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 J(1) = - 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)
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE MINAS GERAIS - FAPEMIG
Aberto
Electrical and magnetic properties of new compounds of the conductor anion [ni(dmit)2] and nitronyl nitroxide magnetic radicals
Mauro Cesar Dias, Humberto Osório Stumpf, Maria Terezinha Caruso Sansiviero, Jean Michel Pernaut, Tulio Matencio, Marcelo Knobel, Danielle Cangussu
Electrical and magnetic properties of new compounds of the conductor anion [ni(dmit)2] and nitronyl nitroxide magnetic radicals
Mauro Cesar Dias, Humberto Osório Stumpf, Maria Terezinha Caruso Sansiviero, Jean Michel Pernaut, Tulio Matencio, Marcelo Knobel, Danielle Cangussu
Fontes
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Química nova Vol. 30, n. 4 (July/Aug., 2007), p. 904-908 |