高等学校化学学报

高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (11): 1452.

• 论文 • 上一篇    下一篇

分析量子化学研究(Ⅱ)--光度分析新显色剂对甲基偶氮氯膦离解与质子化作用及其机理

周伟良, 杜迎翔, 徐钟隽, 潘教麦   

  1. 华东师范大学化学系, 上海, 200062
  • 收稿日期:1990-05-28 出版日期:1991-11-24 发布日期:1991-11-24
  • 通讯作者: 周伟良
  • 基金资助:

    国家自然科学基金

Studies on Analytical Quantum Chemistry(Ⅱ)--The Protonation and Dissociation of a New Chromogcnic Reagent-Chlorophosphonazo-p-Methyl and Their Mechanism

Zhou Wei-liang, Du Ying-xiang, Xu Zhong-jun, Pan Jiao-mai   

  1. Department of Chemistry, East Chian Normal University, Shanghai, 200062
  • Received:1990-05-28 Online:1991-11-24 Published:1991-11-24

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摘要： 对甲基偶氮氯膦(CPApM)作为不对称偶氮氯膦类光度分析显色剂,已应用于稀土氧化物与有关矿石、镍基合金中测定钇的含量,本文以分光光度法测得了CPApM的离解常数及质子化常数,运用HMO法进行半经验量子化学计算,并对其电子结构、离解作用与质子化作用及微观机理作了探讨。

关键词: 光度分析显色试剂, 离解作用, 质子化作用, HMO法

Abstract: The protonation and dissociation of chlorophosphonazo-p-methyl(CPApM) in aqueous solution have been studied spectrophotometrically. The protonation constant (lgKp) was found to be -0. 158±0. 005 and the dissociation constant (pKa)11. 41 ± 0. 03. The electronic structure of CPApM and microcosmic mechanism of protonation and dissociation of the reagent are interpreted by the calculation with quantum chemistry.

Key words: Spectrophotometric chromogenic reagent, Protonation, Dissociation, HMO method

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