【摘要】 应用pH法,在25.0±0.1℃,0.1M NaClO₄,30％（V/V）乙醇水溶液中,测定了以邻菲罗啉（phen）为第一配体（A）,N-（对位取代苯基）氨基乙酸（p-RphG;R=CH₃O,CH₃,H,Cl:G=NHCH₂COOH）为第二配体（B）的Cu（Ⅱ）,Ni（Ⅱ）,Co（II）,Zn（Ⅱ）三元配合物的生成常数1ogK_MAB^MA.结果表明,三元配合物的稳定性与第二配体的酸碱强度之间存在着直线自由能关系,即logK_MAB^MA=apK_B+C.文章讨论了影响三元配合物稳定性的各种因素.三元配合物稳定性的增加可以用金属离子与phen之间形成π反馈键来解释.与二元体系比较,Ni（Ⅱ）和Zn（Ⅱ）的三元配合物稳定性增长更大.此现象可以用π反馈键的生成以及分子内配体的芳环之间的重叠来解释.更多还原

【Abstract】 The formation constants of ternary mixed ligand complex compounds (log K_MAB^MA formed from 1, 10-phenanthroline （A）, N-（para-substituted phenyl）glycines, p-RC₆H₄-NHCH₂COOH （B, p-RPhG, R=CH₃O, CH₃, H, Cl） with copper （II）, nickel（II）, cobalt（H） and zinc（II） were determined by pH method at 25℃ in 30% （volume） ethanol solution in presence of 0.1M NaClO₄. It was found that some linear free energy relationships exist between the stability of M（U）-phen-p-RPhG ternary complex compounds and the base strengths of the ligands p-RPhG, conforming to the equation log K_MAB^MA=apK_b+C. The factors influencing the stability of the ternary complex compounds have been discussed. The enhancement of stability of ternary complex compounds was explained by the formation of π backbonding between metal ion and the ligand 1, 10-phenanthroline. In contrast to the binary system, the ternary Ni（II） and Zn（H） complexes showed higher stability which phenomenon might be accounted for by the formation of π back bonding and by intramolecular ligand-ligand interaction, possibly aromatic stacking.更多还原