高等学校化学学报 ›› 1983, Vol. 4 ›› Issue (1): 48.

• 论文 • 上一篇    下一篇

分光光度法研究镧与间硝基偶氮氯膦(CPAmN)的络合物形成反应

徐钟隽, 潘教麦, 胡昭圣, 贾锡平   

  1. 华东师范大学化学系
  • 收稿日期:1981-02-12 出版日期:1983-02-24 发布日期:1983-02-24

SPECTROPHOTOMETRIG STUDY ON THE COMPLEX FORMATION BETWEEN LANTHANUM AND CHLOROPHOSPHONAZO-m-NO2 (CPAmN)

Xu Zhongjun(Hsu Chung-gin), Pan Jiaomai, Hu Zhaosheng(Hu Chao-sheng), Jia Xiping   

  1. Department of Chemistry, East China Normal University, Shanghai
  • Received:1981-02-12 Online:1983-02-24 Published:1983-02-24

摘要: 本文研究了CPAmN试剂的特性、La-GPAmN络合物的组成和β-型络合物的生成条件,并测定了其积累稳定常数。

Abstract: Protonation of chlorophosphonazo-m-NO2 takes place in acidic medium (Ig Kp = -2.11) while dissociation of the first hydroxyl group from naphthalene ring is shifted toward the basic region (pKα= 10.21) .Various complexes of La-CPAmN are formed in the pHrange of 1.5-2.0. The mole ratios La/CPAmN of these complexes have been estimated to be 1:1, 1:2 and 1:3 by Job's continuous variation method and the equilibrium shift method. The β-type complex (1:1) giving a characteristic maximum absorption at 715 nm is formed under a certain experimental condition.The 1:3 complex existed in the excess of reagent is very stable in acidic medium with an overall stability constant lg Ks, of 45.40.

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