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Sandwich-type polyoxotungstate hybrids decorated by nickel-aromatic amine complexes
Authors:Peng-Tao Ma  Yue Shen
Institution:Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
Abstract:Three new sandwich-type polyoxotungstates (POTs) decorated by nickel-2,2′-bpy complexes {Ni(2,2′-bpy)2(H2O)}2{Ni(2,2′-bpy)}2 {Ni4(H2O)2(B-α-XW9O34)2}]n− (X=PV, n=4 for 1; X=AsV, n=4 for 2; X=GeIV, n=4 for 3) (2,2′-bpy=2,2′-bipyridine) were successfully synthesized under hydrothermal conditions and structurally characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction, and magnetic properties. Single-crystal structural analyses indicate that 1 and 2 are isostructural and both crystallize in the monoclinic space group C2/c, whereas 3 belongs to the triclinic space group View the MathML source. To our knowledge, 1, 2 and 3 represent rare examples of the organic-inorganic hybrid sandwich-type polyoxometalates functionalized by multiple nickel-aromatic amine complexes. Magnetic measurements of 1 exhibit the presence of ferromagnetic interactions within the rhombic tetranuclear-NiII cluster.
Keywords:Polyoxometalate  Hydrothermal reaction  Nickel  Sandwich structure  Organoamine
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