有机试剂结构与性质的研究Ⅲ.对羟基偶氮苯的酸碱平衡及其存在形式的研究

Study of structure and properties of organic reagents Ⅲ.Study of acid-base equilibrium and State of p-hydroxyazobenzene

用分光光度法研究了对羟基偶氮苯(HAB)的酸碱平衡,在 CTMAB 存在下,pK_1=-1.42,pK_2=8.20,CTMAB 不存在时 pK_1=-0.92,pK_2=8.41。用量子化学方法研究了 HAB 在不同酸度介质中的存在形式,所得结果与激光拉曼光谱测定的结果相符。还研究了表面活性剂存在下,吸收光谱变化的可能机理。

The spectrophotometric behaviour and acid-base properties of p-hydroxyazobenzene in the ab-sence and presence of cationic surfactant aredescribed.Its presence changes the dissociation ofthe reagent to a more acidic region.The state ofp-hydroxyazobenzene has been studied by spectro-photometric and quantum-chemical methods.