噻唑偶氮对苯二酚与苯并噻唑偶氮对苯二酚的合成及对其分析性质的研究

• 作 者: 童沈阳 李克安
• 机 构: 北京大学化学系,北京大学化学系,
• 出 处: 化学试剂
• 发表日期: 1985年04期
• 关键词: 偶氮 对苯二酚 偶氮类 偶氮化合物 苯并噻唑 吡啶偶氮 互变异构 络合滴定 合成 指示剂

杂环偶氮化合物,特别是吡啶偶氮类化合物,如PAN和PAR等,在分析化学中的重要性是已为人们所熟知的。为了提高这类试剂的选择性,引入酸性较强的噻唑核代替吡啶核,合成了噻唑偶氮类试剂如TAN、TAR等,作为光度试剂及络合滴定指示剂。最近等应用量子力学方法研究了估量和提高反应对照性的方法。他们指出,偶氮类试剂在溶液中存在着偶氮型与醌型的互变异构平衡。

The importance of heterocyclic azo compounds, particularly pyridine azo compounds such as PAN and PAR, in analytical chemistry is well known. In order to improve the selectivity of these reagents, thiazole azo reagent such as TAN, TAR and so on were synthesized by using thiazole nucleus with strong acidity instead of pyridine nucleus as photometric reagent and complexometric titration indicator. Recently, such as the use of quantum mechanical methods to study the method to estimate and improve the response control. They point out that there is an azo-type and quinoid tautomeric equilibrium in the azo reagent solution.