8-羟基喹啉取代大环配合物的酸分解动力学研究  

Studies on the Dissociation Reactions of 8-Hydroxy-5-quinolyl Substituted Macrocyclic Complexes Catalysed by Acid

作　　者：苏循成[1] 周志芬[1] 林华宽[1] 朱守荣[1] 孙宏伟[1] 赵广华 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》2000年第9期1085-1089,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(29671020)

摘　　要：合成了新型双功能化的8-羟基喹啉取代二氧四胺大环.这类新配体含有两个配位活性中心,在适当条件下,能分别与金属离子配位.根据pH电位滴定和紫外光谱实验的结果,在L(配体):M(金属离子)=1:1的情况下,8-羟基喹啉完全配位而二氧四胺大环只能部分配位,研究了在不同温度和不同酸度下8-羟基喹啉取代二氧四胺大环铜(Ⅱ)配合物酸催化的分解动力学行为.根据实验数据,提出了合理的反应机理.实验发现此类酸分解反应与以往二氧四胺大环酸分解机理有显著的不同,但大环的配位仍对该配合物的酸分解行为有很大的影响.Two new 8 - hydroxy - 5 - quinolyl substituted dioxotetraamine macrocyclic ligands containing two independent chelating groups were prepared. As pH titration and UV absorption experiments indicated, in the copper(Ⅱ) complex of molar ratio metal: ligand =1:1, 8 - hydroxyquinolyl was 100% chelated to copper(Ⅱ) ion while dioxotetraamine was only partially so over pH 3- 9. Studies on the acid - induced dissociations of such complex species MLH-1 at various temperatures and acid concentrations were conducted. Based on the experimental data an appropriate reaction mechanism was suggested. The results showed that the dissociation mechanism was different from the classical one, while the partly coordinated dioxotetraamine macrocycles in the copper complexes played important roles during the pre - equilibrium process.

关 键 词：配合物 酸分解 动力学 8-羟基喹啉 大环多胺 

分 类 号：O641[理学—物理化学]