Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (11): 1049-1051.doi: 10.3866/PKU.WHXB19971118

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Thermodynamic Studies on Labthanide Complexes with Tetraazamacrocycle

Bi Jian-Hong,Zhao Xiang-Da,Ni Shi-Sheng,Xie Fu-Xin   

  1. Department of Chemistry,Anhui Institute of Education,Hefei 230061|Department of Chemistry,Anhui University,Hefei 230039
  • Received:1997-05-22 Revised:1997-08-15 Published:1997-11-15
  • Contact: Zhao Xiang-Da

Abstract:

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.

Key words: N-tetraacetic acid substituted tetraazamacrocycle, Lanthanide complex, Stability aomstant, Enthalpy