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  

作　　者：WANG JingPing MA PengTao NIU JingYang 

机构地区：[1]Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, China Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, China Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, China

出　　处：《Science China Chemistry》2007年第6期784-789,共6页中国科学（化学英文版）

基　　金：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)

摘　　要：A new organic-inorganic hybrid polyoxometalate based on Dawson-like polyoxotungstate anion [SbW18O60]9, formulated [Co(2,2′-bpy)3]2[Co(2,2′-bpy)2Cl][Co(2,2′-bpy)2]H2[SbW18O60]·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.A new organic-inorganic hybrid polyoxometalate based on Dawson-like polyoxotungstate anion [SbW_(18)O_(60)]^(9-),formulated [Co(2,2''-bpy)3]2[Co(2,2''-bpy)2Cl][Co(2,2''-bpy)2]H2[SbW_(18)O_(60)] · 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 [SbW_(18)O_(60)]^(9-)encapsulating a pyramidal {SbO3} group within the {W_(18)} cluster cage.EPR spectra show that the high-spin octahedral Co^(II)and low-spin Co^(II)ions coexist in the title compound.Magnetic properties indicate that the compound is antiferromagnetic.

关 键 词：polyoxometalate  Dawson-like  crystal structure  hydrothermal SYNTHESIS 

分 类 号：N[自然科学总论]