A Cubane-Substituted Polyoxoanion: Structure and Magnetic Properties of Cs<sub>2</sub>[H<sub>2</sub>PW<sub>9</sub>Ni<sub>4</sub>O<sub>34</sub>(OH)<sub>3</sub>(H<sub>2</sub>O)<sub>6</sub>]·5H<sub>2</sub>O
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The novel polyoxometalate [H2PW9Ni4O34(OH)3(H2O)6]2- (1) has been synthesized and characterized by IR spectroscopy, polarography, elemental analysis, and magnetic measurements. An X-ray single-crystal analysis was carried out on Cs2[H2PW9Ni4O34(OH)3(H2O)6]·5H2O, which crystallizes in the orthorhombic system, space group Pbcn, with a = 24.3131(3) Å, b = 21.5400(1) Å, c = 19.8936(3) Å, V = 10418.4(2) Å3, Z = 8, and ρcalcd = 3.767 g/cm3. Structural analysis based on 14 734 independent reflections leads to a solution, R = 8.04% (I > 2σ(I)). Anion 1 consists of a Ni4O4 cubane fragment which is inserted into a trivacant lacunary B-α-[PW9O34]9- Keggin unit. Magnetic measurements show that the Ni−Ni exchange interactions are ferromagnetic.
创建时间：
2016-08-18
