Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (6): 953-958.DOI: 10.1016/S1872-2067(19)63358-9

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A novel dicobalt-substituted tungstoantimonate polyoxometalate:Synthesis, characterization, and photocatalytic water oxidation properties

Qing Hana, Di Sunc, Junwei Zhaod, Xiangming Lianga, Yong Dinga,b   

  1. a State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, China;
    b State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
    c Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China;
    d Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecule and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, Henan, China
  • Received:2019-01-23 Revised:2019-03-25 Online:2019-06-18 Published:2019-04-26
  • Contact: S1872-2067(19)63358-9
  • Supported by:

    This research was financially supported by the National Natural Science Foundation of China (21773096), the Fundamental Research Funds for the Central Universities (lzujbky-2018-k08), and the Natural Science Foundation of Gansu Province (17JR5RA186).

Abstract:

The one-pot assembly reaction of a trilacunary, lone-pair-containing[B-α-SbW9O33]9- precursor with Co2+ ions in an aqueous medium led to the isolation of a novel {SbO3(H2O)3} bridging, dicobalt-substituted, sandwich-type tungstoantimonate {Co2Sb2(H2O)10[B-β-SbW9O33]2}4- (1a). This compound was structurally characterized in the solid state by single-crystal X-ray diffraction, elemental analyses, thermogravimetric analysis, and IR spectroscopy. The most remarkable feature was that 1a comprises two trilacunary[B-β-SbW9O33]9- fragments trapping a novel, centrally symmetric, rhomb-like {Co2Sb2} belt with 10 terminal water molecules. When combined with the photosensitizer [Ru(bpy)3]2+ and the sacrificial electron acceptor S2O82-, 1a exhibited efficient catalytic activity for water oxidation with a remarkable turnover number (TON) of 193, initial turnover frequency (TOFinitial) of 5.3 s-1, O2 yield of 30.8%, and quantum yield (ФQY) of 36.2% under light-driven conditions.

Key words: Light-driven water oxidation, Tungstoantimonate, Self-assembly