高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (2): 123.

• 研究论文 • 上一篇    下一篇

六聚钨酸与十聚钨酸在溶液中的相互转化

朱思三, 顾翼东   

  1. 复旦大学化学系
  • 收稿日期:1987-07-15 出版日期:1989-02-24 发布日期:1989-02-24
  • 通讯作者: 朱思三
  • 基金资助:

    国家自然科学基金

Interconversion Between Hexa- and Decatungstic Acids in Solutions

Zhu Sisan, Gu Yidong(Yih-Tong Ku)   

  1. Department of Chemistry, Fudan University, Shanghai
  • Received:1987-07-15 Online:1989-02-24 Published:1989-02-24

摘要: 用紫外吸收光谱法研究了六聚钨酸和十聚钨酸在溶液中的相互转化过程,鉴定了相互转化的产物,测定了转化反应速率常数和表观活化能。还考察了酸度、温度及水对转化反应的影响。

关键词: 六聚钨酸, 十聚钨酸, 相互转化, 紫外吸收光谱

Abstract: The interconversion between hexa- and decatungstic acids in solutions has been studied through UVabsorption spectra data.. In aq. solution at pH 1-4, H2W6O19changes rapidly to H4W10O32The rate constant k is 5.3 × 10-3s-1, t1/2being 1.31s, at pH 3.57 and 25℃. Hydrogen ion retards the conversion from W6O192- to W10O324-.On the contrary, H4W10O32in organic media slowly transforms into H2W6O19at ordinary temparature. Its complete conversion will need about 30 days at 25℃. When temparature rises to 78℃, however, it will only require half an hour. Water inhibits the change from W10O52to W6O192-seriously.The interconversion between them can therefore be taken as.

Key words: Hexatungstic acid, Decatungstic acid, Interconversion, UV absorption spectrum

TrendMD: