应用化学 ›› 1996, Vol. 0 ›› Issue (3): 50-54.

• 研究论文 • 上一篇    下一篇

镍(Ⅱ)-氨基酸水杨醛席夫碱-α-氨基酸三元配合物的稳定性

刘树祥, 田来进, 田君濂, 毕思玮, 高恩庆, 曹沛森, 潘锋   

  1. 曲阜师范大学化学系 曲阜 273165
  • 收稿日期:1995-10-06 修回日期:1996-02-01 出版日期:1996-06-10 发布日期:1996-06-10
  • 基金资助:
    山东省自然科学基金资助课题

Stability of Ternary Mixed Ligand Complexes of N-Salicylideneaminio Acid and or-Amino Acid with Nickel(Ⅱ)

Liu Shuxiang, Tian Laijin, Tian Junlian, Bi Siwei, Gao Enqing, Cao Peisen, Pan Feng   

  1. Department of Chemistry, Qufu Normal University, Qufu 273165
  • Received:1995-10-06 Revised:1996-02-01 Published:1996-06-10 Online:1996-06-10

摘要: 在(25±0.1)℃,I=0.1 mol/L KNO3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 logβ120与 pK2A、logβ102与 pK2B、logβ111与 pK2B 以及 logβ111与 pK2A 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.

关键词: 镍(Ⅱ), 直线自由能关系, 席夫碱, 疏水缔合作用

Abstract: The dissociation constants of N-salicylideneamino acids(Sal:A)and stability contants of binary complexes of Ni(Ⅰ)-salicylideneamino acid and Ni(Ⅱ)-α-amino acid and ternary mixed ligand complexes of Ni(Ⅱ)-N-salicylideneamino acid(ligand A)-α-amino acid (ligand B)at(25±0.1)℃ and in the presence of 0.1mol/dm3 KNO3 have been determined by pH method.The a-amino acids(Aa)used were glycine(Gly),L-serine(Ser),L-valine (Val),L-leucine(Leu),L-isoleucine(Iso)and L-proline(Pro).It was found that the linear free energy relationship(LFER)exists nicely between the following parameter pairs logβ120 and pK2A,logβ102and pK2B,logβ111 and pK2A,logβ111and pK2B.The △logK was used to characterize the stability of ternary complexes related to the stability of parent binary complexes. The hydrophobic ligand-ligand interaction in the Ni(Sal:P)(P denotes phenylalanine)was studied.

Key words: nickel(Ⅱ), linear free energy relationship, Schiff base, hydrophobic ligancl-ligand interaction