高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (5): 610.

• 研究论文 • 上一篇    下一篇

差示脉冲极谱法对镉(Ⅱ)-草酸-琥珀酸混配三元配合物的研究

康敬万, 卢小泉, 高锦章, 白光弼   

  1. 西北师范大学化学所, 兰州 730070
  • 收稿日期:1992-06-16 修回日期:1993-01-08 出版日期:1993-05-24 发布日期:1993-05-24
  • 通讯作者: 康敬万
  • 基金资助:

    国家自然科学基金;甘肃省教委基金

Differential Pulse Polarographic Studies on Composite-Coordinated Complexes of Cadmium (Ⅱ) with Oxalate and Succinate

KANG Jing-Wan, LU Xiao-Quan, GAO Jin-Zhang, BAT Guang-Bi   

  1. Institute of Chemistry, Northwest Normal University, Lanzhou, 730070
  • Received:1992-06-16 Revised:1993-01-08 Online:1993-05-24 Published:1993-05-24

PDF (PC)

被引次数

8

摘要： 用差示脉冲极谱法研究了以琥珀酸(Succ)作为第一配体,草酸(OX)为第二配体与镉(Ⅱ)形成的混配三元配合物,计算表明,有3个三元配合物形成。在20±0.2℃时测得的稳定常数分别为:[Cd(OX)(Succ)]2-,Igβ11=4.68;[Cd(OX)2(Succ)]4-、Igβ21=5.75;[Cd(OX)(Succ)]4-,Igβ12=5.68;在35±0.2℃结果为Igβ'11=4.61,Igβ'21=5.74,Igβ'12=5.67,也求得配合物的热力学函数、混合常数Km和稳定化常数Km的对数值均大于零,说明三元配合物[Cd(OX)(Succ)]比对应的二元配合物稳定。

关键词: 镉(Ⅱ)-草酸-琥珀酸, 稳定常数, 热力学函数, 差示脉冲极谱法

Abstract: Ternary complexes of cadmium (Ⅱ) with succinate(Succ) as primary ligand and oxalate (OX) as secondary ligand were studied by means of differential pulse polarography at 20±0.2℃, 35±0.2℃ and μ= 0.1(NaNO3).On the basis of the values of the stability constant, the thermodynam-ic functions (△G0, △H0, △S0) were calculated.The simple complexes of Cd(Ⅰ) and each kind of ligand were investigated.The positive values of mixing constant (lgKm = 0.83) and stabilization constant(lgKs = 0.52) prove that the ternary complex [Cd(OX)(Succ)] is more stable than the corresponding binary complexes.The stability constants of composite-coordinated complexes are lgβ11 = 4.68, Igβ21 = 5.75 and lgβ12 = 5.68 at 20℃ and lgβ11 = 4.61, lgβ21= 5.74 and lgβ12 = 5.67 at 35℃.

Key words: Cd (Ⅱ)-oxalate-succinate, Stability constant, Themodynamic function, Differential pulse polarography

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