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用 p H-电位滴定法测定了在 3 7°C,μ=0 .1 mol/L KNO3,3 0 %二氧六环 /水 (体积分数 )条件下 ,Cd(IP) (Aa) +三元配合物的平衡常数 lgβ及相对于二元配合物的表征常数Δlg K和 lg X。其中 IP为咪唑邻啡啉 ,Aa-分别为丙氨酸 (Ala-)、α-氨基己二酸 (Ami-)、精氨酸 (Arg-)、赖氨酸(Lys-)和酪氨酸 (Tyr-)。实验结果表明 ,Ami-、Arg-、Lys-和 Tyr-4个体系配合物Δlg K和 lg X均比相应的 Ala-体系大。从配体间的电子效应、疏水效应和氢键作用等方面对配合物的额外稳定性进行了讨论。
The concentration of Cd (IP) (Aa) + tris (p-toluenesulfonic acid) was determined by p H -potential titration at 37 ℃, μ = 0.1 mol / L KNO3, The equilibrium constant lgβ of the metathesis and the characterization constants Δlg K and lg X relative to the binary complex. Wherein IP is imidazophosphamine, Aa is alanine, ami-, arg-, lysi- and tyramine, respectively, Acid (Tyr-). The experimental results show that the Ami, Arg-, Lys- and Tyr-4 system complexes Δlg K and lg X are larger than the corresponding Ala-system. The additional stability of the complexes was discussed in terms of the electronic effects between ligands, hydrophobic effects and hydrogen bonding interactions.