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中南大学学报(自然科学版)

Journal of Central South University

第14卷    第2期    总第36期    1983年6月

    

    

正烷基亚氨二乙酸与二价过渡金属离子络合平衡的研究——正烷基亚氨二乙酸根离子的加质子常数
殷群生1,张祥麟1,陈超球1

(1.化学系)

摘 要: 本文介绍五种长碳链的正烷基亚氨二乙酸(Cn H2n+1 N(CH2COOH)2,其中n=6,8,10,12,14)的合成。在25±0.1℃,表观离子强度0.1(KNO3)的条件下,用pH电位法测定了上述各酸根离子的三级加质子常数。用HClO14标定pH计求取了混合溶剂中H+的浓度;推导了线性回归法计算K2H和K3H的公式。

 

关键字: 亚氨二乙酸; 加质子常数; 混合溶剂; 过渡金属离子; 十四烷基; 络合平衡; 酸根离子; 线性回归法; 离子强度; 氧己环

INVESTIGATIONS ON COMPLEX EQUILIBRIA OF n-ALKYL IMINODIACETIC ACIDS WITH DIVALENT TRANSITION-METAL IONS -Determination of Protonation Constants of n-Alkyl Iminodiacetate Ions
殷群生1,张祥麟1,陈超球1

1.化学系

Abstract:Five n-alkyl iminodiacetic acids CnH2n+1 N (CH2COOH)2, in whichn=6, 8, 10, 12 or 14, were synthesized from chloroacetic acid and thecorresponding amines according to A.Stein′s method. The protonation constants of the five n-alkyl iminodiacetate ions havebeen determined at 25±0.1℃ and the apparent ionic strength 0.1 (KNO3)with the pH-potentiometric method in the mixed solvent water-dioxane(75% dioxane by volume). The protonation constant of n-hexyl iminodiac-etate ion has also been determined in the aqueous solution at the sametemperature and the same apparent ionic strength with the same method. For these ligands, K1H>>K2H, but K2H and K3H differ not much from eachother. Therefore, Bjerrum′s half n (formation function) method was appliedto evaluating the first protonation constants of these ligands while thesecond and third protonaton constants were evaluated with both thelinear regression method and the formulas derived by ourselves. The protonation constants determined are listed in the following table.

 

Key words:

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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