论文部分内容阅读
在(25±0.1)℃,I=0.1 mol/L KNO_3条件下,应用 pH 法测定了氨基酸水杨醛席夫碱(Sal:A)的酸离解常数,镍(Ⅱ)分别与氨基酸水杨醛席夫碱和α-氨基酸(Aa)的二元配合物稳定常数以及镍(Ⅱ)-氨基酸水杨醛席夫碱(A 配体)-α-氨基酸(B 配体)三元配合物的稳定常数,实验发现,在 logβ_(120)与 pK_2~A、logβ_(102)与 pK_2~B、logβ_(111)与 pK_2~B 以及 logβ_(111)与 pK_2~A 之间均存在良好的直线自由能关系.同时以稳定性数据为探针,研究了镍(Ⅱ)-水杨醛缩苯丙氨酸(Sal:P)-α氨基酸三元体系中,配合物 Ni(Sal:P)(Aa)分子内存在的配体间疏水缔合作用.
The acid dissociation constant of salicylic acid salicylaldehyde Schiff base (Sal: A) was determined by pH method under the conditions of (25 ± 0.1) ℃ and I = 0.1 mol / L KNO 3. stability constants of the binary complexes of α-amino acids (Aa) and the stability constants of ternary complexes of nickel (Ⅱ) -salicylic acid Schiff base (A ligand) -α-amino acid (B ligand) There was a good linear free energy relationship between log β 120 and pK 2 A, log β 102 and pK 2 B, log β 111 and pK 2 B, and log β 111 and pK 2 A. In addition, Data were used as probes to study the effect of the ligands existing in the Ni (Sal: P) (Aa) complex of nickel (Ⅱ) -salicylalanine phenylalanine (Sal: P) Between the hydrophobic association.