高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (2): 207.

• 论文 • 上一篇    下一篇

N-和对位取代苯胺及其正离子基在二甲亚砜溶液中的酸性解离常数

赵永昱, 还振威, 程津培   

  1. 南开大学化学系, 天津, 300071
  • 收稿日期:1993-06-07 修回日期:1993-09-10 出版日期:1994-02-24 发布日期:1994-02-24
  • 通讯作者: 程津培
  • 作者简介:赵永显,男,27岁,博士生.
  • 基金资助:

    国家自然科学基金;国家教委优秀年轻教师基金;国家教委博士点基金;国家教委留学归国人员科研基金

Acidities of α-and para-Substituted Anilines and of the Corresponding Radical Cations in DMSO Solution

ZHAO Yong-Yu, HUAN Zhen-Wei, CHENG Jin-Pei   

  1. Department of Chemistry, Nankai University, Tianjin, 300071
  • Received:1993-06-07 Revised:1993-09-10 Online:1994-02-24 Published:1994-02-24

摘要: 本文报道了在DMSO中测定的N-取代苯胺和对位取代乙酰苯胺的酸性解离常数[pKa(HA)].利用热力学循环原理,通过对pKa和中性分子及其共轭碱的氧化电位的测定,求得了用直接方法难以得到的正离子基的酸性解离常数[pKa(HA)],并对所得的pKa(HA)和pKa(HA)的取代基效应进行了讨论。

关键词: pKa(NA), pKa(HA+·, ), 正离子基, 取代基效应

Abstract: Acidities of the α- and para-substituted anilines and their radical cations were determined respectively by an accurate spectrophotometric titration and by a thermochemical evaluation.The simple method used in estimating the acidities of radical cations involves combining the equilibrium acidities of the parent acids(HA) in DMSO with the oxidation potentials of the neutral molecules,Eox(HA), and of their conjugate bases,Eox(A-), defined from a thermodynamic cycle.The results were discussed in terms of the substituent effects.

Key words: pKa(HA), pKa(HA), Radical cation, Substituent effect

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