Calorimetric Titration of Complexation of the N-benzylmonoaza-18-Crown-6 with Rare Earth（Ⅲ）Nitrates in Anhydrous Acetonitrile
来源期刊：Journal of Rare Earths1993年第4期
论文作者：鲁统部 谭民裕 井上佳久
文章页码：246 - 251
摘 要：<正> Calorimetric titrations were performed in anhydrous acetonitrile at 298.15 K,giving the com-plex stability constants（Ks）and the thermodynamic parameters for the complexation of the rare earth ni-trates（La～Er,Yb）with N-benzylmonoaza-18-crown-6（18-C-6）.Thermodynamic quantities clearly in-dicate that the coordination stability of the arm-type 18-crown-6 with the lanthanoid nitrates increasesfrom Ce to Gd,and decreases slightly from Gd to Tb with increasing atomic number.The coordination of thearm-type 18-C-6 with Gd shows the stonger complexation ability and selectivity.Thermodynamically theformation of the complexes is evidently driven by enthalpy,but the complexes stability sequence is essentiallyentropy governed.
鲁统部，谭民裕，井上佳久
摘 要：<正> Calorimetric titrations were performed in anhydrous acetonitrile at 298.15 K,giving the com-plex stability constants（Ks）and the thermodynamic parameters for the complexation of the rare earth ni-trates（La～Er,Yb）with N-benzylmonoaza-18-crown-6（18-C-6）.Thermodynamic quantities clearly in-dicate that the coordination stability of the arm-type 18-crown-6 with the lanthanoid nitrates increasesfrom Ce to Gd,and decreases slightly from Gd to Tb with increasing atomic number.The coordination of thearm-type 18-C-6 with Gd shows the stonger complexation ability and selectivity.Thermodynamically theformation of the complexes is evidently driven by enthalpy,but the complexes stability sequence is essentiallyentropy governed.
关键词：
