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Citation: Bi Jian-Hong, Zhao Xiang-Da, Ni Shi-Sheng, Xie Fu-Xin. Thermodynamic Studies on Labthanide Complexes with Tetraazamacrocycle[J]. Acta Physico-Chimica Sinica, ;1997, 13(11): 1049-1051. doi: 10.3866/PKU.WHXB19971118 shu

Thermodynamic Studies on Labthanide Complexes with Tetraazamacrocycle

1.
Department of Chemistry,Anhui Institute of Education,Hefei 230061

Received Date: 22 May 1997
Available Online: 15 November 1997

The stability constants of the 1:1 complexes of H4L2 (5,12-dipheny1-7, 14-dimethyl-1,4,8,11-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.
- N-tetraacetic acid substituted tetraazamacrocycle,
- Lanthanide complex,
- Stability aomstant,
- Enthalpy
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