用pH电位滴定法测定了Pt(Ⅱ)与尿苷5'-三磷酸和另一芳环系列配体ArL形成的三元混配配合物Pt(ArL)(UTP)n-(ArL=Phen、Bpy和Trp;n=2或3)在水溶液中的稳定常数(I=0.1mol/L,KNO3,25℃).用△lgKM比较了二元和三元混配配合物的稳定性差异,认为三元混配配合物稳定性的增加可归因于π-酸-π-碱之间的合作效应和分子内芳环配体的堆积作用,后者和参与堆积的芳环大小一致,即稳定性Pt(Phen)(UTP)2-＞Pt(Bpy)(UTP)2-＞Pt(Trp)(UTP)3-.
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