IIB族金属离子-5-取代邻菲罗啉-二酮肟配体三元体系的稳定性研究  

Study on the Stability of Group IIB Metal Ion - 5 - Substituted o - Phenanthroline - Diketooxime Ternary Complexes

作　　者：张耀山[1] 林华宽[1] 汪中明[1] 朱守荣[1] 孙宏伟[1] 陈荣悌[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《化学学报》1998年第11期1048-1054,共7页Acta Chimica Sinica

基　　金：国家自然科学基金(29671020)

摘　　要：在(35±0.1)℃,I=0.1mol·dm^(-3)KNO_3条件下,用pH法测定了二酮肟配体PnAO,5-取代邻菲罗啉(5-Rphen,R=CH_3,H,Cl,NO_2)的质子化常数,Zn(Ⅱ),Cd(Ⅱ),Hg(Ⅱ)分别与PnAO和5-Rpheh二元体系的稳定常数,以及Zn(Ⅱ),Cd(Ⅱ),Hg(Ⅱ)-PnAO-5-Rphen三元体系的稳定常数.实验结果表明,在上述二元、三元体系中均存在良好的直线自由能关系,并从三元配合物构型上讨论了存在线性关系的内在原因.同时,讨论了金属离子、取代基对配合物稳定性的影响.The protonation constants of 3,3,9,9- tetramethyl -4,8- diazaundecane - 2 , 10- dioxime (PnAO), the stability constants of Zn( Ⅱ ), Cd(Ⅱ), Hg(Ⅱ) - PnAO, Zn(Ⅱ), Cd ( Ⅱ) , Hg(Ⅱ ) - 5 - substituted o - phenanthroline binary complexes and Zn(Ⅱ ) , Cd(Ⅱ) , Hg(Ⅱ) - PnAO - 5 - substituted o - phenanthroline ternary complexes have been determined by pH titration method at (35±0. 1)℃, I= 0.1molⅡdm-3 KNO3. The results show that here exist Linear Free Energy Relationships (LFER) between the protonation constants of 5 - substituted o - phenanthroline and the corresponding stability constants of Zn( Ⅱ ), Cd(Ⅱ ) , Hg( Ⅱ) binary complexes as well as the relevant constants for the Zn (Ⅱ), Cd (Ⅱ), Hg (Ⅱ) - PnAO - 5 - substituted o - phenanthroline ternary system. The stability order for the title systems is generally shown by the following: Zn(Ⅱ) > Cd(Ⅱ) < Hg(Ⅱ ) . The internal cause has been explored in terms of the charge/radius effect of the metal ions.

关 键 词：配合物 锌 镉 汞 邻菲罗啉 二酮肟配体 稳定性 

分 类 号：O614.24[理学—无机化学]