The stability constants of the 1:1 complexes of H4L2 (5,12-dipheny1-7, 14-dimethyl1,4,8,11-tetraazamasrocyclotetradecane-N’, N". N"’,N""-tetraacetic acid) with Ln3+ (Ln=La,Nd, Pr, Sm, Eu, Gd, Dy,...The stability constants of the 1:1 complexes of H4L2 (5,12-dipheny1-7, 14-dimethyl1,4,8,11-tetraazamasrocyclotetradecane-N’, N". N"’,N""-tetraacetic acid) with Ln3+ (Ln=La,Nd, Pr, Sm, Eu, Gd, Dy, Yb) were determined by potemtiometric titrations in 0.5mol·L-1 KCl at 40±0.1℃, 50±0.1℃ and 60±0.1℃ respectively. The H. S and G of the coordination reactions of H4L2 with Ln3+ were given. Influences of the steric effect and temperature changes on the stability lanthanide complexes were discussed thermodynamically.展开更多
基金Supported by the National Natural Science Foundation of China(21171119,11574408,81573822,21376008)the Beijing Natural Science Foundation(2172017,2172012)+1 种基金the Beijing Municipal Education Commission(KM201510028006)the Scientific Research Base Development Program of the Beijing Municipal Commission of Education。
文摘The stability constants of the 1:1 complexes of H4L2 (5,12-dipheny1-7, 14-dimethyl1,4,8,11-tetraazamasrocyclotetradecane-N’, N". N"’,N""-tetraacetic acid) with Ln3+ (Ln=La,Nd, Pr, Sm, Eu, Gd, Dy, Yb) were determined by potemtiometric titrations in 0.5mol·L-1 KCl at 40±0.1℃, 50±0.1℃ and 60±0.1℃ respectively. The H. S and G of the coordination reactions of H4L2 with Ln3+ were given. Influences of the steric effect and temperature changes on the stability lanthanide complexes were discussed thermodynamically.