混配铂(Ⅱ)配合物堆积异构平衡的溶剂效应  

Influence of organic solvents on intramolecular isomeric equilibria in ternary mixed-ligand complexes

作　　者：孙洪良[1] 

机构地区：[1]杭州商学院食品生物与环境工程学院,浙江杭州310035

出　　处：《化学研究与应用》2002年第4期439-442,共4页Chemical Research and Application

摘　　要：The stability constants of the ternary mixed ligand complexes Pt(Phen)(CA) +(Phen=1,10 Phenanathroline,CA=carboxylate Ligands) were determined by potentiometric pH titration in aqueous solution and in 30～90%(V/V) aqueous ethanal(I=0.1mol·L -1 ,KNO 3;25℃).The difference of stability among the different complexes was compared and discussed,and the percentages of the stacked isomers in the ternary mixed ligand complexes Pt(Phen)(PCA) +(PCA=2 phenylacetate and 3 phenylpropionate) was calculated.The experimental results indicate that the extent of the intramolecular aromatic ring stacking interaction in the ternary mixed ligand Pt(Phen)(PCA) + complexes depends on the polarity of the solution.The weaker the polarity of the solution,the more notable the intramolecular aromatic ring stacking interaction,the larger the percentage of the stacked isomers in the ternary complexes,and the more stable the ternary mixed ligand complexes.The stability constants of the ternary mixed ligand complexes Pt(Phen)(CA) +(Phen=1,10 Phenanathroline,CA=carboxylate Ligands) were determined by potentiometric pH titration in aqueous solution and in 30～90%(V/V) aqueous ethanal(I=0.1mol·L -1 ,KNO 3;25℃).The difference of stability among the different complexes was compared and discussed,and the percentages of the stacked isomers in the ternary mixed ligand complexes Pt(Phen)(PCA) +(PCA=2 phenylacetate and 3 phenylpropionate) was calculated.The experimental results indicate that the extent of the intramolecular aromatic ring stacking interaction in the ternary mixed ligand Pt(Phen)(PCA) + complexes depends on the polarity of the solution.The weaker the polarity of the solution,the more notable the intramolecular aromatic ring stacking interaction,the larger the percentage of the stacked isomers in the ternary complexes,and the more stable the ternary mixed ligand complexes.

关 键 词：混配铂(Ⅱ)配合物 堆积异构平衡 溶剂效应 稳定常数 芳环堆积作用 三元混配配合物 羧酸 1 10-邻菲绕啉 

分 类 号：O614.826[理学—无机化学]