Giant Polytungstoarsenate Clusters Derived from New [As4W19O68(H2O)]14– Building Blocks

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doi:10.1071/CH09446

Giant Polytungstoarsenate Clusters Derived from New [As₄W₁₉O₆₈(H₂O)]^14– Building Blocks

Song Chang ^A, Zhiming Zhang ^A, Yangguang Li ^A, Shuang Yao ^A, Enbo Wang ^A ^B

^A Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Ren Min Street No. 5268, Changchun, Jilin, 130024, China.
^B Corresponding author. Email: wangeb889@nenu.edu.cn





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Australian Journal of Chemistry 63(4) 680–686 http://dx.doi.org/10.1071/CH09446
Submitted: 26 August 2009 Accepted: 18 December 2009 Published online: 8 April 2010

Abstract

A new compound K₈Na₄[As₄W₁₉O₆₉]·19.5H₂O (1), which can be described as an extended structure of [As₂W₁₉O₆₇(H₂O)]^14–, was synthesized and used as building blocks to construct the high nuclear polytungstoarsenate cluster K₁₀Na₈[(W₁₃O₂₈)(H₂O)₆(OH)₄(AsW₉O₃₃)₄]·56H₂O (2). Polyoxoanion 2 is composed of four trivacant Keggin B-α-type [AsW₉O₃₃] units encapsulating a unique polytungstate cluster W₁₃O₃₂(OH)₄(H₂O)₆, which has never observed in the polyoxometalate chemistry. Electrocatalytic studies indicate that compound 2 displays electrocatalytic activity toward the reduction of nitrate.