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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 acid-base balance of p-hydroxybenzotriazole (HAB) was studied spectrophotometrically with pK_1 = -1.42 and pK_2 = 8.20 in the presence of CTMAB, pK_1 = -0.92 and pK_2 = 8.41 in the absence of CTMAB. Quantitative chemical methods were used to study the existence of HAB in different acidity media. The obtained results are in good agreement with those obtained by laser Raman spectroscopy. The possible mechanism for the change of absorption spectra in the presence of surfactants was also studied.