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高等学校化学研究 ›› 2005, Vol. 21 ›› Issue (1): 1-3.

• Articles •    下一篇

Synthesis, Characterization and Conductivity of α-Keggin-type Nanoparticles, Co(en)<sub>3</sub>PMo<sub>12</sub>O<sub>40</sub>·8H<sub>2</sub>O with Optical Activity

HUANG Ru-dan1, LI Juan2,3, ZHANG Jing1   

  1. 1. Department of Chemistry, School of Science, Beijing Institute of Technology, Beijing 100081, P. R. China;
    2. Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
    3. Department of Chemistry, Normal College, Beihua University, Jilin 132013, P. R. China
  • 收稿日期:2004-01-13 出版日期:2005-01-24 发布日期:2011-07-27
  • 基金资助:

    Supported by the National Natural Science Foundation of China(No.20371007).

Synthesis, Characterization and Conductivity of α-Keggin-type Nanoparticles, Co(en)3PMo12O40·8H2O with Optical Activity

HUANG Ru-dan1, LI Juan2,3, ZHANG Jing1   

  1. 1. Department of Chemistry, School of Science, Beijing Institute of Technology, Beijing 100081, P. R. China;
    2. Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
    3. Department of Chemistry, Normal College, Beihua University, Jilin 132013, P. R. China
  • Received:2004-01-13 Online:2005-01-24 Published:2011-07-27
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20371007).

PDF (PC)

摘要： Polyoxometallates Co(en)3PMo12O40·8H2O(+,-)[abbreviated as PMo12-Co(+,-)], nanoparticles were synthesized by the chemical precipitation reaction at room temperature for the first time.They were characterized by means of elemental analyses, IR spectrometry and X-ray diffraction.The images of scanning electron microscopy(SEM) and the results of calculation by using the Scherrer equation for the line widths of the XRD patterns were used to estimate the average particle size of the powder products, which was 40 nm.The results show that the nanoparticle size was affected by starting materials′ concentrations.The particles had a small size and a narrow distribution, when the concentrations of H3PMo12O40·24H2O and Co(en)3I3·H2O were around 1.7×10-4 and 1.0×10-3 mol/L, respectively.When the concentration was increased, there was no significant increase in the particle size, but more polydisperse Co(en)3(PMo12O40)(+, -) were obtained.In poly(ethylene glycol)(PEG) with an average molecular weight(MW) of 600 g/mol and containing LiClO4[n(O)/n(Li)=100∶1] as the supporting electrolyte, the conductivity of the composite system increases upon the addition of PMo12-Co(+ or -) nanoparticles, which was measured by the a.c.impedance technique.The interactions among PEG, LiClO4, PMo12, and Co can be used to explain that the PMo12-Co(+ or -) nanoparticles could promote the conductivity of the PEG-LiClO4-PMo12-Co system.

关键词: Polyoxometallates, Nanoparticles, α-Keggin structure, Optical activity

Abstract: Polyoxometallates Co(en)3PMo12O40·8H2O(+,-)[abbreviated as PMo12-Co(+,-)], nanoparticles were synthesized by the chemical precipitation reaction at room temperature for the first time.They were characterized by means of elemental analyses, IR spectrometry and X-ray diffraction.The images of scanning electron microscopy(SEM) and the results of calculation by using the Scherrer equation for the line widths of the XRD patterns were used to estimate the average particle size of the powder products, which was 40 nm.The results show that the nanoparticle size was affected by starting materials′ concentrations.The particles had a small size and a narrow distribution, when the concentrations of H3PMo12O40·24H2O and Co(en)3I3·H2O were around 1.7×10-4 and 1.0×10-3 mol/L, respectively.When the concentration was increased, there was no significant increase in the particle size, but more polydisperse Co(en)3(PMo12O40)(+, -) were obtained.In poly(ethylene glycol)(PEG) with an average molecular weight(MW) of 600 g/mol and containing LiClO4[n(O)/n(Li)=100∶1] as the supporting electrolyte, the conductivity of the composite system increases upon the addition of PMo12-Co(+ or -) nanoparticles, which was measured by the a.c.impedance technique.The interactions among PEG, LiClO4, PMo12, and Co can be used to explain that the PMo12-Co(+ or -) nanoparticles could promote the conductivity of the PEG-LiClO4-PMo12-Co system.

Key words: Polyoxometallates, Nanoparticles, α-Keggin structure, Optical activity