| Synthesis, crystal structure and properties of a new organic-inorganic hybrid Dawson-like polyoxotungstate [Co(2,2′-bpy)_3]_2[Co(2,2′-bpy)_2Cl][Co(2,2′-bpy)_2]H_2- [SbW_(18)O_(60)]·4H_2O |
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| 基金项目： | Supported by the Program for New Century Excellent Talents in University of Henan Province (2005HANCET-02)，the Natural Science Foundation of Henan Province, the Program for Training Young Excellent Cadreman Teachers in University of Henan Province, the Stress Foundation of Henan University(05ZDZR002) |
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| 摘 要： | A new organic-inorganic hybrid polyoxometalate based on Dawson-like polyoxotungstate anion SbW18O60]9, formulated Co(2,2′-bpy)3]2Co(2,2′-bpy)2Cl]Co(2,2′-bpy)2]H2SbW18O60]·4H2O (2,2′-bpy= 2,2′-bipyridine) has been synthesized from Sb2O3, Na2WO4, CoCl2, and 2,2′-bipyridine materials by hydrothermal method, and which was characterized by elemental analyses, IR, XPS, EPR, TG, and X-ray single crystal diffraction. Structure analysis shows that the polyoxoanion self-assembled under hydrothermal conditions consists of a Dawson-like polyoxotungstate cluster anion SbW18O60]9 en- capsulating a pyramidal {SbO3} group within the {W18} cluster cage. EPR spectra show that the high-spin octahedral CoII and low-spin CoII ions coexist in the title compound. Magnetic properties in- dicate that the compound is antiferromagnetic.
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