镉和吡啶络合物的电位研究

AN INVESTIGATION OF CADIUM-PYRIDINE COMPLEXES BY POTENTIOMETRIC METHOD

1950年 B.E.Douglas,H.A.Latinen 及 J.C.Bailar 曾经用极谱法研究了镉离子 Cd++及吡啶 C5H5N（在本文中以 Py 表示）在水溶液中形成的络合物,他们认为在镉离子和吡啶之间存在着两种络离子:Cd（Py）++及 Cd（Py）++,在吡啶浓度为0.4—1M 时主要是前者,1—2M 时则为后者;并求出稳定常数分别为 K2=102.14及

The complexes formed by Cd^(++)ion and pyridine in aqueous solution were investigated by potentiometric titration.The experimental data were treated by Leden's method.Three complexes wtere found to be present in the solution,namely,Cd(py)^(++),Cd(py)_2^(++) and Cd(py)_2^(++);and he successive stability constants are K_1=23±2,K_2=118±=5,K_3=574±15.