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Two 3D networks based on sandwich-type polyoxometalate units linked by Sr-O clusters: Synthesis, structure, and magnetic property |
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| Authors: | Yang Yu Bai-Bin Zhou Kai Yu Yu-Nan Zhang |
| Institution: | a Key Laboratory of Materials Physics and Chemistry, Colleges of Heilongjiang Province, Harbin Normal University, Harbin 150080, PR China b Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, PR China c Heilongjiang Beikai Professional and Technology College, Harbin 150317, PR China |
| Abstract: | Two 3D hybrid sandwich-type polyoxometalates, {Sr(H2O)5Sr(H2O)6Sr0.5(H2O)7}2Mn4(H2O)2(α-PW9O34)2]·6H2O (1) and {Sr(H2O)6Sr(H2O)8]2Sr(H2O)4}2Mn4(H2O)2(αββα-P2W15O56)2]·5H2O (2), have been obtained by the routine synthetic reactions in aqueous solution and characterized by IR, elemental analysis, thermal analysis, and X-ray single-crystal diffraction. The 3D hybrid framework of 1 and 2 are built by tetra-MnII substituted sandwich-type polyoxotungstates modified by fourteen Sr(H2O)x (x=4-8) units acting as bridges, forming centrosymmetric sandwich structures. The magnetic property of compound 1 has been studied by measuring its magnetic susceptibility in the temperature range of 2-300 K, which indicates predominant ferromagnetic interactions between the MnII-O-MnII bridge unit. Additionally, the electrochemical behaviours have been detected on solid bulk modified carbon paste electrodes of compounds (CPEs) and three redox couples are detected. |
| Keywords: | Polyoxometalates Sandwich complexes Strontium High-coordinated Magnetic property |
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