Synthesis, structural and magnetic characterization of a new copper(II)-nitronyl nitroxide radical complex

Journal of the Brazilian Chemical Society

Kalisz Marguerite²  Miguel A. Novak¹  Carlos B. Pinheiro¹  Antonio S. Florencio¹  Gervais Chapuis¹  Andrea Caneschi¹  Maria G. F. Vaz¹ 

[1] ,Universidade Federal do Rio de Janeiro Instituto de Química Rio de Janeiro RJ ,Brazil

关键词: molecular magnetism;    coordination complexes;    nitronyl nitroxide radical;   

DOI  :  10.1590/S0103-50532007000500007

来源: SciELO

【 摘 要 】

In this work we describe the structure and the magnetic properties of a new copper(II)-NIT complex, where NIT stands for nitronyl nitroxide radical. This was achieved using (NBu4)4[Cu2(bopba)] as a precursor (where NBu4+ is the tetrabutylammonium cation and bopba is bis-o-phenylenebis(oxamate)), whose crystal structure was resolved and its magnetics properties studied. From the reaction of this precursor with a cationic nitronyl nitroxide radical, a new compound was prepared and magnetically characterized, namely (pEtRad)4[Cu2(bopba)] (where pEtRad+ stands for the cationic para-2-(4-pyridil)-4,4,5,5-tetramethylimidazoline-1 -oxyl-3-oxide radical). The magnetic properties suggest that in this six-spin complex there is a competition between short range ferromagnetic and antiferromagnetic interactions. The ferromagnetic interaction can be explained by the orthogonality of the involved magnetic orbitals.

【 授权许可】

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