偶氮氯膦-mA(CPA mA)离解作用的研究

高等学校化学学报 ›› 1985, Vol. 6 ›› Issue (10): 875.

偶氮氯膦-mA(CPA mA)离解作用的研究

赵泓, 朱传征, 周伟良, 潘教麦

华东师范大学化学系

收稿日期:1984-08-23 出版日期:1985-10-23 发布日期:1985-10-23

Studies on the Dissociation of Ghlorophosphonazo-mA [2-(4-Ghloro-2-Phosphonobenzenenazo)-7-(3- Acetylbenzenenazo)-1,8-Dihydroxynaphthalene-3,6- Disulfonic Acid

Zhao Hoag, Zhu Chuanzheng, Zhou Weiliang, Pan Jiaomai

Department of Chemistry, East China Normal University, Shanghai

Received:1984-08-23 Online:1985-10-23 Published:1985-10-23

摘要/Abstract

摘要： 本文用pH电位法和分光光度法研究了偶氮氯膦-mA的六级离解作用,测定了其逐级电离常数,计算了离解过程的热力学参数△G°、△H°、△S°,同时与对硝基偶氮氯膦的离解常数进行了比较,其结果与量子化学计算基本相符。

Abstract: The purification of chlorophosphonazo-mAwas reported. The dissociation of chlorophosphonazo-mAin aqueous solution was studied by spectrophtometric and potentiometric titration methods. The values of dissociation constants, pK₁=0.38, pK₂=1.12, pK₃ = 2.74, pK₄ = 6.79, pK₅ = 9.73, pK₆ = 11.46, were determined by spectrophotomeric method at identical temperature and ionic strength (20℃, μ = 0.4). Under identical conditions the results, pK₃ = 3.11, pK₄ = 6.83, pK₅ = 9.75, pK₆ = 11.52, obtained by using the potentio metric tritration method agreed well with those obtained by the spectrophoto metric method.The dissociation constants were measured by the potentio metric titration method at various temperatures. The thermodynamic parameters, ΔG°,ΔH° and ΔS°, for the dissociation process were calculated.The difference between the dissociation constants of chlorophosphonazo-mAand chlorophosphonazo-pNwas satisfactorily interpreted by the difference in the values of net atomic charge density distribution obtained with quantum chemistry calculations.

TrendMD:

赵泓, 朱传征, 周伟良, 潘教麦. 偶氮氯膦-mA(CPA mA)离解作用的研究. 高等学校化学学报, 1985, 6(10): 875.

Zhao Hoag, Zhu Chuanzheng, Zhou Weiliang, Pan Jiaomai . Studies on the Dissociation of Ghlorophosphonazo-mA [2-(4-Ghloro-2-Phosphonobenzenenazo)-7-(3- Acetylbenzenenazo)-1,8-Dihydroxynaphthalene-3,6- Disulfonic Acid. Chem. J. Chinese Universities, 1985, 6(10): 875.