在25℃,I=0.1mol·dm~(-3)NaClO_4的条件下,在混合溶剂[50％(v/v)二氧六环和70％(v/v)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. The pH was measured in a mixed solvent [50% (v / v) dioxane and 70% (v / v) ethanol] at 25 ° C with I = 0.1 mol · dm -3 NaClO 4 The protonation constants of N, N’-bis (para-substituted phenyl) ethylenediamine and the formation constants of binary complex with copper (Ⅱ) and nickel (Ⅱ) There is a good linear relationship between the protonation constant and the formation constant of the complex, between the σ ’value of the ligand and the substituent constant σ in the Hammett equation, and between the stabilization factor S_f and the σ value The experiment further verifies the universality of the existence of linear free energy in coordination chemistry.