引用本文:
刘树祥, 田来进, 田君濂, 毕思玮, 高恩庆, 曹沛森, 潘锋. 镍(Ⅱ)-氨基酸水杨醛席夫碱-α-氨基酸三元配合物的稳定性[J]. 应用化学,
1996, 13(3): 50-54.
Citation: Liu Shuxiang, Tian Laijin, Tian Junlian, Bi Siwei, Gao Enqing, Cao Peisen, Pan Feng. Stability of Ternary Mixed Ligand Complexes of N-Salicylideneaminio Acid and α-Amino Acid with Nickel(Ⅱ)[J]. Chinese Journal of Applied Chemistry, 1996, 13(3): 50-54.
Citation: Liu Shuxiang, Tian Laijin, Tian Junlian, Bi Siwei, Gao Enqing, Cao Peisen, Pan Feng. Stability of Ternary Mixed Ligand Complexes of N-Salicylideneaminio Acid and α-Amino Acid with Nickel(Ⅱ)[J]. Chinese Journal of Applied Chemistry, 1996, 13(3): 50-54.
镍(Ⅱ)-氨基酸水杨醛席夫碱-α-氨基酸三元配合物的稳定性
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.
English
Stability of Ternary Mixed Ligand Complexes of N-Salicylideneaminio Acid and α-Amino Acid with Nickel(Ⅱ)
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,logβ102 and pK2B,logβ111 andp pK2A,logβ111 and 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.
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