The first azide(mu1,1)-bridged binuclear cobalt(II)-imino nitroxide complex with ferromagnetic behavior |
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Authors: | Wang Li-Ya Zhao Bin Zhang Chen-Xi Liao Dai-Zheng Jiang Zong-Hui Yan Shi-Ping |
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Institution: | Department of Chemistry, Nankai University, Tianjin 300071, P. R. China. |
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Abstract: | The first azide(mu1,1)-bridged binuclear cobalt(II) complex with a chelated imino nitroxide radical, Co2(immepy)2(N3)(4)].2EtOH, was structurally and magnetically characterized, where immepy = 4,4,5,5-tetramethyl-2-(6'-methyl-2'-pyridyl) imidazoline-1-oxyl. Five nitrogen atoms complete the coordination sphere of the Co(II) ion, showing a distorted trigonal bipyramid geometry. Two N(3)(-) anions act as bridges between cobalt ions in the mu1,1 coordination mode, resulting in a binuclear structure with an inversion center. Magnetic studies show that ferromagnetic couplings occurred between the adjacent cobalt(II) ions through N3(-)(mu1,1)) bridges, and antiferromagnetic couplings between the cobalt(II) ions and organic radicals. |
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