高等学校化学学报

高等学校化学学报 ›› 1980, Vol. 1 ›› Issue (1): 35.

• 论文 • 上一篇    下一篇

镍(Ⅱ)-IMDA-HBG及镍(Ⅱ)-Tart-HBG体系的pH电位法测定--N-邻羟基苄基氨乙酸(HBG)及其络合物的研究(Ⅱ)

张华麟   

  1. 复旦大学化学系
  • 收稿日期:1979-11-13 出版日期:1980-06-24 发布日期:1980-06-24

pH-METRIC DETERMINATION OF Ni(Ⅱ)-IMDA-HBG AND Ni(Ⅱ)-Tart-HBG SYSTEMS--STUDIES ON N-o-HYDROXYBENZYLGLYCINE (HBG) AND ITS COMPLEXES--Ⅱ

Zhang Hualin   

  1. Department of Chemistry, Fudan University
  • Received:1979-11-13 Online:1980-06-24 Published:1980-06-24

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摘要： 用pH电位法研究了在0.1MKCl水溶液中(30.0±0.1℃)的镍(Ⅱ)-亚氨基二乙酸(IMDA)与N-邻羟基等基氯乙酸(HBG)的加合反应、镍(Ⅱ)-酒石酸(Tart)与HBG的取代反应以及镍(Ⅱ)-HBG的络合反应,并测得了Ni(Ⅱ)-IMDA-HBG加合反应平衡常数K111、混合型络合物积累生成常数β111和Ni(Ⅱ)-Tart-HBG取代反应平衡常数K1r、混合型络合物积累生成常数β111以及Ni(Ⅱ)-HBG络合物的逐级生成常数K101、K102、积累生成常数β102和Ni(Ⅱ)-Tart络合物的积累生成常数β120。其结果如下:Ni(Ⅱ)-IMDA-HBG体系lgk1117.10,lgβ11115.36Ni(Ⅱ)-Tart-HBG体系lgk1r5.13,lgβ11112.68,lgβ120。7.55Ni(Ⅱ)-HBG体系lgk1019.07,lgk1025.54,lgβ10214.61讨论了pH滴定曲线、混合型络合物和Ni-HBG络合物的稳定性以及碱性范围Ni(Ⅱ)与Tart可能的络合形式。

Abstract: The addition reaction of Ni (Ⅱ)-Iminodiacetic acid (IMDA) with HBG and the displacement reaction of Ni(Ⅱ)-Tartaric acid (Tart) with HBG as well as the complexation of Ni(Ⅱ) with HBGwere studied by pH--metrically in aqueous solution at 30.0±0.1℃in the presence of 0.1M potassium chloride.The equilibrium constants of addition reaction and displacement reaction (k111and kr1),the over-all formation constants of two mixed-ligand complexes (β111) as well as the step-wise formation constants of Ni(Ⅱ)-HBGchelate (k101,k102) and the over-all formation constant of Ni(Ⅱ)-Tart chelate (β120) were determined.The results are summarized as follows;Ni(Ⅱ)-IMDA-HBG.lgk1117.10,lgβ11115.36;Ni(Ⅱ)-Tart-HBG:lg kr15.13,lgβ111 12.68,lgβ1207.55;Ni(Ⅱ)-HBG: lgk1019.07,lgk1025.54,lgβ12014.61.The pHtitration curves,the stability of mixed-ligand complexes and Ni(Ⅱ)-HBGchelate as well as the possible chelated-form of Ni(Ⅱ)-Tart chelate in basic condition were discussed.

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