摘要
用pH电位法测定40%(V/V)二(口恶)烷-水介质中(I=0.1,25±0.1℃)Pd(Ⅱ)A(bpy、trp^-)-ATP^(4-)体系形成三元混配合物Pd(bpy)(ATP)^(2-)和Pd(trp)(ATP)~3的稳定常数,其lgK_(Pd(A)(ATP)^(2-))^(Pd(A))值分别为5.16和4.11,Jlgk值为-0.02和-1.08,并与lgK_(Pd(phen)(ATP)^(2-))^(Pd(A))-作了比较,其稳定顺序为Pd(phen)(ATP)^(2-)〉Pd(bpy)(ATP)~2〉Pd(trp)(ATP)^(3-).这一变化规律可从配体间πA～πB的合作效应及配体A和ATP^4间芳环堆积作用获得满意解释.
The stability constants of the ternary mixed ligand complexes Pd(A) (ATP)2-, where A = 2,2-bipyridyl (bpy), DL-tryptophan(trp), and ATP4-= adenosine 5-tri phosphate, have been determined by potentiometric pH titration in 40%(Ⅴ/Ⅴ) dioxane-water solution (I = 0.1,25±0.1℃). For the bpy, trp systems, the 1gKpd(A)(ATP)Pd(A) 2- or △1gK values of the ternary mixed ligand complexes Pd(A)(ATP)2- are 5.16,4.11 or -0.03, -1.08, respectively. The stability of Pd(A)(ATP)2- decrease in the order: Pd(phen)(ATP)2->Pd(bpy)(ATP)2->Pd(trp)(ATP)3-. The enhanced stability might be explained by the cooperative effect of πA-πB and the aromatic-ring stacking interaction, resulting from the ligand A and ATP4- in the complexes Pd(A)(ATP)2-.
出处
《杭州大学学报（自然科学版）》
CSCD
1992年第1期83-87,共5页
Journal of Hangzhou University Natural Science Edition
基金
国家自然科学基金资助项目
关键词
混配合物
稳定常数
钯
PH电位法
stability constant
Pd2+A(bpy, trp)-ATP
cooperative effect
aromatic-ring stacking.
