Two new tetranuclear complexes of the macrocyclic oxamide [MCu3] (M = Cd, Mn, macrocyclic oxamide = 1,4,8,11-tetraazacyclotradecanne-2,3-dione): syntheses, spectra and magnetic properties |
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| Authors: | Yan Ouyang Wei Zhang Yue Ma Na Xu Dai-Zheng Liao Kazuyoshi Yoshimura Shi-Ping Yan |
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| Institution: | (1) Department of Chemistry, Nankai University, Tianjin , 300071, P. R. China;(2) Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan |
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| Abstract: | Two new tetranuclear complexes of macrocyclic oxamide Cd(CuL)3](NO3)2·2.5H2O 1, Mn(CuL)3(OH)2](ClO4)2·Mn(H2O)6·4.5H2O 2 (L = 1,4,8,11-tatraazacyclotradecanne-2,3-dione) have been synthesized, structurally characterized and preliminary investigated
by magnetic studies. The structures of the title complexes consist of a tetranuclear units MCu3 (M = Cd, Mn), the packing diagram shows two-dimensional and three-dimensional system through intermolecular weak interactions.
The temperature-dependent magnetic susceptibilities of complex 2 were analyzed by an approximate treatment leading to J = −33 cm−1, gCu = 2.10, gMn = 1.95 indicating antiferromagnetic exchange between Cu(II) and Mn(II) ions. |
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| Keywords: | Tetranuclear complexes Macrocyclic complexes Crystal structure Magnetic properties |
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