Hydrothermal synthesis, structures and magnetic studies of transition metal sulfates containing hydrazine |
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Authors: | Jia Li-Hui Li Ru-Yin Duan Zhi-Ming Jiang Shang-Da Wang Bing-Wu Wang Zhe-Ming Gao Song |
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Institution: | Beijing National Laboratory of Molecular Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. |
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Abstract: | By employing hydrothermal method, six transition metal sulfates containing hydrazine (N(2)H(4)) have been obtained: M(SO(4))(2)(N(2)H(5))(2)](n) (M = Mn(1), Co(2), Ni(3)) and M(N(2)H(4))SO(4)](n) (M = Mn(4), Co(5), Ni(6)). Their crystal structures and magnetic properties have been investigated experimentally and theoretically. Compounds 1-3 consist of one-dimensional sulfate bridged homometallic chains with protonated hydrazine molecule as terminal ligand, and compounds 4-6 are hydrazing-sulfate mixed bridged homometallic three-dimensional frameworks. Compounds 1-6 exhibit antiferromagnetic coupling between M(2+) ions, but their magnetic properties differ at low temperatures because of the different single-ion anisotropy and crystal structures. The magnetostructural correlations and the magnetic coupling mechanism are analyzed by density functional theory calculations (DFT). |
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