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Hydrothermal Synthesis, Crystal Structures and Electrochemical Properties of Two Phosphatotungstates Containing Keggin Clusters, [Cu(2,2′-bipy)2]5[PW12O40] · 2H2O and (Hpip)3[PW12O40]

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Abstract

Two new phosphatotungstates containing Keggin clusters, [Cu(2,2′-bipy)2]5[PW12O40] · 2H2O (1) (2,2′-bipy = 2,2′-bipyridine) and (Hpip)3[PW12O40] (2) (pip = piperazine) have been hydrothermally synthesized and characterized by IR, element analysis and cyclic voltammogram. Compound 1 consists of one discrete Keggin polyanion [PW12O40]5−, five isolated complex cations [Cu(2,2′-bipy)2]+ and two water molecules. The organic moieties exhibit regular packing with offset aromatic–aromatic interactions between the bipys, leading to a compact supramolecular framework structure. Compound 2 is made up of one discrete Keggin polyanion [PW12O40]3− and three pip cations. Compounds 1 and 2 were employed to fabricate bulk-modified carbon paste electrode to research on their electrochemistry properties. Their electrochemical behaviors and electrocatalysis that 1- and 2-CPEs have electrocatalytic activities toward the oxidation of nitrite. Compound 1 is in the orthorhombic system, space group Pna21, with a = 28.1928(9), b = 21.5479(6), c = 19.9088(6) Å, V = 12,094.5(6) Å3 and Z = 4. Compound 2 is in the rhombohedral system, space group R\( \overline{3} \)c, with a = 17.9191(5), c = 23.7439(9) Å, V = 6,602.6(4) Å3 and Z = 6.

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Acknowledgments

The authors thank the NSF of Fujian Province (nos. E0420001, 2005HZ01-4) and NCETFJ for financial support.

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Authors and Affiliations

  1. Department of Applied Chemistry, Huaqiao University, Quanzhou, 362021, China

    Ling Bai, Bi-Zhou Lin, Xiu-Feng Huang, Zhi-Jian Chen & Xue-Gong Cao

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  1. Ling Bai
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  2. Bi-Zhou Lin
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  3. Xiu-Feng Huang
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Correspondence to Bi-Zhou Lin.

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Bai, L., Lin, BZ., Huang, XF. et al. Hydrothermal Synthesis, Crystal Structures and Electrochemical Properties of Two Phosphatotungstates Containing Keggin Clusters, [Cu(2,2′-bipy)2]5[PW12O40] · 2H2O and (Hpip)3[PW12O40]. J Clust Sci 19, 561–572 (2008). https://doi.org/10.1007/s10876-008-0202-9

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