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化学学报
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化学学报 ›› 1988, Vol. 46 ›› Issue (2): 121-125. 上一篇    下一篇

研究论文

配合物的稳定性与配位体的酸碱强度之间的直线自由能关系VIII:N,N'-双(对位取代苯基)乙二胺与铜(II),镍(II)生成配合物的稳定性研究

陈荣悌;贺占博;古宗信   

  1. 南开大学化学系
  • 发布日期:1988-02-15

Linear free energy relationships between stability of complex compounds and strengths of acid base of ligands VIII: N,N'-Bis(para-substitute phenyl)ethylenediamine-copper(II) and nickel(II)

CHEN RONGTI;HE ZHANBO;GU ZONGXIN   

  • Published:1988-02-15

PDF

671

被引次数

8

在25℃, I=0.1mol.dm^-^3NaClO4的条件下,在混合溶剂[50%(υ/υ)二氧六环和70%(υ/υ)乙醇]中用pH法测定了N,N'-双(对位取代苯基)乙二胺的质子化常数及其与铜(II),镍(II)生成二元配合物的生成常数.结果表明:在配位体的质子化常数与配合物的生成常数之间,在配位体的σ'值与Hammett方程中的取代基常数σ之间,以及稳定化因子S~f与σ值之间,均存在着良好的线性关系.从实验进一步验证了在配位化学中直线自由能关系存在的普遍性.

关键词: 二苯基烃 P, 稳定性, 络合物, 铜离子, 镍离子, 酸碱平衡, 线性自由能关系, 乙二胺 P, 配位体

The protonation constants of N,N'-bis(p-substituted phenyl)ethylenediamines and the formation constants of their complexes with Cu(II) and Ni(II) were determine by pH-titrn. at 25?and ionic strength 0.1 (NaClO4) in mixed solvents [50 vol.% aqueous dioxane and 70 vol.% aqueous EtOH]. The results showed that linear relations exist between ligand constants and the corresponding Hammett constants, the stability factor and the Hammett constants, the formation constants of the complexes and the ligand protonation constants This is further evidences for the existence of linear free energy relationships in coordination chem.

Key words: HYDROCARBON WITH TWO PHENYLS P, STABILITY, COMPLEX COMPOUNDS, COPPER ION, NICKEL ION, ACID-BASE EQUILIBRIUM, LINEAR FREE ENERGY RELATIONSHIP, ETHANEDIAMINE P, LIGANDS

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