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
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.
