高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (9): 1453.

• 论文 • 上一篇    下一篇

粉状白钨酸研究(ⅩⅨ)——聚乙烯醇水溶液中十聚钨酸的稳定性和光化学还原

岳斌, 唐立昊, 朱思三, 林欣荣   

  1. 复旦大学化学系, 上海, 200433
  • 收稿日期:1997-07-02 出版日期:1998-09-24 发布日期:1998-09-24
  • 通讯作者: 朱思三
  • 作者简介:岳斌,男,30岁,博士.
  • 基金资助:

    国家自然科学基金(批准号:29571009)资助课题.

Studies on White Powdery Tungstic Acid(→) Stability and Photochemistry of Decatungstic Acid in Aqueous Solution Containing Polyvinyl Alcohol

YUE Bin, TANG Li-Hao, ZHU Si-San, LIN Xin-Rong   

  1. Department of Chemistry, Fudan University, Shanghai, 200433
  • Received:1997-07-02 Online:1998-09-24 Published:1998-09-24

摘要: 粉状白钨酸在含聚乙烯醇的水溶液中能够形成十聚钨酸,通过紫外-可见吸收光谱、顺磁共振、pH滴定及五价钨的测定对十聚钨酸的稳定性和光致变色性质进行了研究,结果表明,十聚钨酸的还原程度与溶液的酸度有关,在较高的pH条件下形成单电子还原物种,而在较低的pH条件下则主要形成双电子还原物种.

关键词: 粉状白钨酸, 聚乙烯醇, 十聚钨酸, 稳定性, 光致变色

Abstract: Decatungstic acid can be formed by the reaction of white powdery tungstic acid in aqueous solution containing polyvinyl alcohol. The stability and photochromism of decatungstic acid in homogeneous system have been studied through UV-Vis spectra, ESR, pHtitration and W(Ⅴ) determination. The results show that the reduction degree of decatungstate anion corresponds to the acidity of the solution. One-electron reduced form is produced mainly at high pHvalue while two-electron reduced form mainly at low pHvalue.

Key words: White powdery tungstic acid (WPTA), Polyvinyl alcohol, Decatungstic acid, Stability, Photochromism

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