Abstract
The dimeric polyoxometalate Na 7K 3[{γ-SiW 10O 34} 2(μ 2-O) 2Ni(H 2O) 2] · 18H 2O ( 1) has been successively obtained in an aqueous solution system. Compound 1 represents the first dimeric polyoxometalates accommodating a nickel ion between the two [γ-SiW 10O 36] 8− units which are fused together in an asymmetrical mode to constitute the unprecedented tungsten-oxo fragment. Compound 1 was characterized by IR spectrum, UV spectrum, elemental analyses and single-crystal X-ray diffraction. The IR spectrum of 1 indicates that the γ-type polyoxoanion exists in the dimeric compound. The UV spectra also could be used to confirm that polyoxoanions existing in the compound are the Keggin structure.
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