Magnetic interactions in a new heterospin complex involving nitroxide radical and oxamido-bridged copper(II)

Author: Chen Jing   Song You   Gao Dong-Zhao   Liao Dai-Zheng   Jiang Zong-Hui   Yan Shi-Ping  

Publisher: Taylor & Francis Ltd

ISSN: 0095-8972

Source: Journal of Coordination Chemistry, Vol.60, Iss.9, 2007-01, pp. : 929-936

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Abstract

A new binuclear copper(II) complex [Cu2(oxpn)(IM2py)2](ClO4)2, containing four spin carriers with pyridyl-substituted nitroxide radicals has been synthesized and characterized structurally and magnetically (oxpn = N,N'-bis(3-aminopropyl)oxamido, IM2py = 2-(2'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl). The structure of the complex consists of centrosymmetric trans oxamido-bridged copper(II) binuclear units and nitroxide radicals. The coordination geometry around each copper atom is distorted square pyramidal and the apical position is occupied by a nitrogen atom of the imidazoline ring of a radical ligand. Magnetic analysis indicates that the complex exhibits strong antiferromagnetic coupling between copper(II) ions through the oxamido bridge and a ferromagnetic interaction between copper(II) ions and radical ligands. The magnetic behaviour is discussed with reference to the crystal structure.

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