Cu(UTP)^(2-)和芳香氮碱混配配合物的分子内堆积作用

Intramolecular Stacking Interaction in Ternary Complexes of Cu(UTP) 2- with Heteroaromatic N Base Ligands

用ｐＨ电位滴定法测定了三元混配配合物Ｃｕ（ＵＴＰ）Ｌ２－（Ｌ＝吡啶，３，４－二甲基吡啶，异喹啉）在水溶液中的稳定常数，并通过比较三元混配配合物Ｃｕ（ＵＴＰ）Ｌ２－和二元配合物ＣｕＬ２＋的稳定常数，指出在ＵＴＰ的嘧啶环和芳香氮碱的芳香环之间存在着堆积作用，而且在相同的实验条件下，Ｃｕ（ＵＴＰ）Ｌ２－分子内的堆积作用弱于Ｃｕ（ＡＴＰ）Ｌ２－分子内的堆积作用．

The stability constants of the ternary complexes Cu(UTP)L 2- ,where L=pyridine,3,4 lutidine and isoquinoline,have been determined in aqueous solution by potentiometrical method. Comparison of the stability constants of ternary complexes Cu(UTP)L 2- with those of the binary complexes CuL 2+ ,shows stacking interaction between the aromatic ring of the N base and the pyrimidine moiety of UTP.The stacking interaction is much weaker than that in corresponding Cu(ATP)L 2- complexes under the same conditions.