Bicine单电荷阴离子与芳香氮碱形成的三元金属离子混配配合物的稳定性研究  

Studies of stability of ternary metal ion complexes formed by the anion of bicine and heteroaromatic N bases

作　　者：贺小凤[1] 计亮年[2] 

机构地区：[1]深圳教育学院理化生系,广东深圳518029 [2]中山大学化学系,广东广州510275

出　　处：《分子科学学报》2000年第1期12-15,共4页Journal of Molecular Science

基　　金：国家自然科学基金!资助项目 ( 2 95 710 3 3 )

摘　　要：用 pH电位滴定法首次研究了水溶液中三元混配配合物M(Bic)L+(M2 +=Ni2 +或Zn2 +,L =苯并咪唑、吡啶、3,4-二甲基吡啶、异喹啉 ,Bic- =N ,N -双 (羟乙基 )甘氨酸的单电荷阴离子 )的稳定性 .三元混配配合物相对于二元配合物的稳定性差值用ΔlgKM=lgKM(Bic)M(Bic)L-lgKMML来表示 .结果表明这些三元混配配合物比统计规律所估计的要稳定得多 ,且ΔlgKZn大于ΔlgKNi.三元混配配合物稳定性增大可归因于πA-πB 协同作用和Zn2 +配位构型的转变 .The stability of the ternary complexes of M(Bic)L + ( M 2+ = Ni 2+ or Zn 2+ , L = Benzimidazole,Pyridine,3,4-Lutidine,Isoquinoline and Bic - = N, N-bis ( 2- hydroxyethyl) glycinate) has been firstly studied by means of potentiometric pH titrition in aqueous solution. The stability of ternary complexes in relation to the stability of their binary parent complexes was characterized by Δlg K M = lg K M(Bic) M(Bic)L - lg K M ML . The results show that these ternary complexes are more stable than would be expected on statistical grounds and Δlg K Zn is larger than Δlg K Ni . This increased stability may be attributed to π A- π B cooperative effect and the change in the coordination sphere of Zn 2+ ion.

关 键 词：三元混配配合物 BICINE 芳香氮碱 金属离子 

分 类 号：O641.4[理学—物理化学]