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。
The interconversion between hexa- and decatungstic acids in solutions has been studied through UV absorption spectra data.. In aq. solution at pH 1-4, H2W6O19 changes rapidly to H4W10O32. The rate constant k is 5.3 × 10-3s-1, t1/2 being 1.31 s, at pH 3.57 and 25℃. Hydrogen ion retards the conversion from W6O192- to W10O324-.On the contrary, H4W10O32 in organic media slowly transforms into H2W6O19 at 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 W10O52 to W6O192- seriously.The interconversion between them can therefore be taken as.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第2期123-128,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
六聚钨酸
十聚钨酸
转化
吸收光谱
Hexatungstic acid, Decatungstic acid, Interconversion,UV absorption spectrum
