某些铅(Ⅱ)、镉(Ⅱ)的三元配合物中的直线自由能关系

Linear Free Energy Relationship in Some Ternary Complexes of Pb(Ⅱ) and Cd(Ⅱ)

本文报导在铅(Ⅱ)和镉(Ⅱ)的三元配合物MLA(其中L为2,2′—联吡啶(bipy)或邻菲咯啉(phen),A为丁二酸根(suc^(2-))、邻苯二甲酸根(pht^(2-))和4—硝基邻苯二甲酸根(npht^(2-)))中,三元配合物的稳定性与配体A的碱性之间的直线自由能关系,并与相应的二元配合物MA_2进行了比较,对二者的差别和某些造成复杂化的因素进行了讨论。

In this paper, Linear free energy relationship between stability of metal complexes and basicity of ligands in some ternary complexes MLA was reported where M=Pb(Ⅱ) or Cd(Ⅱ); L=2,2'-bipyridyl or 1,10-phenanthroline;A=succinate, phthalate and 4-nitrophthalate. The linear relation between the stability of ternary complexes, logK_(MLA)~ML, or log/β_(MLA)~M and the basicity of ligands A, pK_(a2), are of fine regularity. The results were compared with binary complexes MA_2. The obvious differences between them were found. Accounting for the above mentioned relationship and other complicated factors were also briefly discussed.