Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (3): 329-333.doi: 10.1007/s40242-016-5429-7

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Hydrothermal Synthesis, Structure and Properties of a New Phosphomolybdate Based on Novel [Co(H2O)4(HP2Mo5O23)]8- Anions and [H8(H2O)16]8+ Water Cluster Cations

ZHANG Zaichao1, HU Gonghao2, XU Yan2   

  1. 1. Jiangsu Key Laboratory for the Chemistry of Low-dimensional Materials, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an 223300, P. R. China;
    2. State Key Laboratory of Materials-oriented Chemical Engineering, College of Chemistry and Chemical Engineering,Nanjing Tech University, Nanjing 210009, P. R. China
  • Received:2015-11-06 Revised:2016-01-29 Online:2016-06-01 Published:2016-02-28
  • Contact: XU Yan E-mail:zhangzc@hytc.edu.cn;yanxu@njtech.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21571103) and the Qing Lan Project of Jiangsu Province, China.

Abstract:

A pure inorganic [P2Mo5O23]6- based cobalt complex [H8(H2O)16][Co(H2O)4(HP2Mo5O23)2] with a sandglass-like shape was synthesized and characterized by means of single-crystal X-ray diffraction, powder X-ray diffraction(PXRD), infrared spectroscopy(IR), thermogravimetry/differential scanning calorimetry(TG/DSC), ultraviolet-visible spectroscopy(UV-Vis) and cyclic voltammogram(CV). Single-crystal X-ray diffraction analysis reveals that the asymmetric unit of compound 1 consists of a half cobalt ion, one [P2Mo5O23]6- anion, two coordinated water molecules and eight lattice water molecules. It is especially intriguing to note that two [P2Mo5O23]6- clusters are symmetrical about the Co ion, like a sandglass. And a chair-like water cluster with an unprecedented centrosymmetric [H8(H2O)16]8+ can be observed in compound 1. Additionally, the electrochemical and catalytic properties of compound 1 were also investigated.

Key words: Hydrothermal synthesis, Phosphomolybdate, Crystal structure, Water cluster