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2013 , Vol. 71 >Issue 01: 107 - 113

DOI: https://doi.org/10.6023/A12050254

研究论文

具有优良传导性能杂多酸复合物{[Co(H2O)8][H(H2O)3](HINO)4(PW12O40)}n的合成, 结构和性质研究

  • 段显英 ,
  • 郭利兵 ,
  • 王建莉
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  • a 河南省科学院化学研究所 郑州 450002;
    b 南京大学配位化学国家重点实验室 南京 210093

收稿日期: 2012-05-29

  网络出版日期: 2012-12-10

基金资助

项目受河南省基础与前沿技术研究计划(No. 122300410090)资助.

收起

A Good Proton-conductive Polyoxometalate Complex {[Co(H2O)8][H(H2O)3](HINO)4(PW12O40)}n: Synthesis, Crystal Structure and Properties

  • Duan Xianying ,
  • Guo Libing ,
  • Wang Jianli
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  • a Institute of Chemistry, Henan Academy of Sciences, Zhengzhou 450002, China;
    b State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, China

Received date: 2012-05-29

  Online published: 2012-12-10

Supported by

Project supported by Henan Province (No. 122300410090).

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摘要

我们通过质子化水簇H+(H2O)3, 过渡金属离子水簇[Co(H2O)8]2+, Keggin型结构[PW12O40]3-杂多阴离子和N-氧化吡啶-4-甲酸(HINO)的自组装成功地合成了一个质子传导无机-有机复合物. 293 K的单晶结构分析表明化合物是一个具有大的1D通道的3D氢键网络, [PW12O40]3-以聚多阴离子链的形式填充于孔道中. 热重分析结果表明此化合物在100 ℃以下比较稳定, 结构没有发生改变, 在200 ℃虽然失去了结晶水, 但其结构还是比较稳定的. 质子导电性能测试结果表明此化合物在温度为85～100 ℃范围内相对湿度为98%时的电导率达到1×10-3～2×10-3 S·cm-1, 具有良好的导电性. 通过实验结论, 对质子传递的可能机理进行了推测.

关键词： 杂多酸; 晶体结构; 超分子复合物; 传导材料; N-氧化吡啶-4-甲酸

本文引用格式

段显英 , 郭利兵 , 王建莉 . 具有优良传导性能杂多酸复合物{[Co(H2O)8][H(H2O)3](HINO)4(PW12O40)}n的合成, 结构和性质研究[J]. 化学学报, 2013 , 71(01) : 107 -113 . DOI: 10.6023/A12050254

Abstract

One organic/inorganic hybrid complex {[Co(H2O)8][H(H2O)3](HINO)4(PW12O40)}n, was constructed by a self-assembly of H+(H2O)3 clusters, [Co(H2O)8]2+ clusters, [PW12O40]3- anions and isonicotinic acid N-oxide (HINO). It was characterized by X-ray diffraction analysis, elemental analysis, IR, TG, UV, XRD, proton conductivity analysis. In the synthetic procedure of title complex, a mixture of result heteropolyacid cobalt salts CoHPW12O40·nH2O (90 mg, 0.03 mmol) and HINO (17 mg, 0.12 mmol) was dissolved in enough acetonitrile/water (1∶1, V/V) to form a homogeneous solution. Finally, the solution was filtered and the solvent left to evaporate at room temperature. A week later, light red crystals appeared and were collected and dried in air after quickly being washed with water. Single-crystal X-ray diffraction analysis at 293 K showed that complex 1 crystallizes in orthorhombic crystal system, Pnnm, and there was exactly a three-dimensional (3D) hydrogen-bonded network with large one-dimensional (1D) channels, in which [PW12O40]3- anions just filled in the 1D channels and self-assembled into poly-Keggin-anion chains. The result of the UV spectra indicates that the saturated aqueous concentration of 1 is ca. 10-5 mol/L and it is insoluble in water. Thermogravimetric analysis shows no weight loss in the temperature range of 20～100 ℃, indicating that all water molecules in the structure are not easily lost below 100 ℃. The powder X-ray diffraction data exhibits that although crystallized water molecules are lost at 200 ℃, the evacuated complex has the same structure as the single-crystal of 1. Moreover, the powder sample after the proton-conductive measurement has the same supramolecular framework as that of complex 1. Interestingly, the title complex was characterized by a satisfactory ionic conductivity (1×10-3～2×10-3 S·cm-1) in the temperature range of 85 to 100 ℃ only. The mechanism of proton conduction of the title complex is, expected to be similar to that of the vehicle mechanism, that is, the direct diffusion of additional protons with water molecules (Grotthuss mechanism).

Key words： polyoxometalate; crystal structure; supramolecular complex; conducting materials; isonicotinic acid N-oxide

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