3D Coordination Polymer of [HW7O24]5– Stabilized by a Copper(II) Complex and Sodium Cations: Structure, Solid-State Stability, and Aqueous Solution Behavior

Authors

  • Xin-Fang Wang,

    1. Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Institute of Technology, Beijing 100081, P. R. China, Fax: +86-10-68912631
    2. Department of Chemistry, Dezhou University, Dezhou Shandong 253023, P. R. China
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    • Equal contribution.

  • Jie Cao,

    1. Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Institute of Technology, Beijing 100081, P. R. China, Fax: +86-10-68912631
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    • Equal contribution.

  • Kun-Lin Huang,

    1. College of Chemistry, Chongqing Normal University, Chongqing 400047, China
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  • Yan-Qing Xu,

    1. Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Institute of Technology, Beijing 100081, P. R. China, Fax: +86-10-68912631
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  • Ying-Nan Chi,

    1. Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Institute of Technology, Beijing 100081, P. R. China, Fax: +86-10-68912631
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  • Chang-Wen Hu

    1. Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Institute of Technology, Beijing 100081, P. R. China, Fax: +86-10-68912631
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  • Dedicated to Professor Michael T. Pope on the occasion of his 80th birthday

Abstract

Compound Na[Cu(en)2]2[HW7O24]·5H2O (1, en = ethanediamine), as the first example of a heptatungstate polymer, has been synthesized in H2O/dmso and characterized by single-crystal X-ray diffraction, IR, UV/Vis, and ESI-MS. The [HW7O24]5– cluster in 1, as an inorganic hexadentate ligand, coordinates to two Na+ and four [Cu(en)2]2+ cations to construct a 3D extended structure. The solid-state stability of 1 at room temperature was proven by X-ray powder diffraction and digital camera techniques. The electrospray mass spectra suggest that most of the [HW7O24]5– dissociates into relatively more stable [W6O19]2– species in aqueous solution because the coordination bonds around the [HW7O24]5– anions are broken by the solvation effect of water on the the copper cation. These results demonstrate that a transition-metal-complex cation plays an important role in the isolation and stabilization of a highly charged polyoxometalate anion.

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