Thermodynamic Studies on N-Diacetic acid substituted tetraazamacrocycle and Its Lanthanide Complexes

Abstract

Abstract: The protonation constants of the macrocycle H₂L(C-meso-meso-5, 12-diphenyl-7,14-dimethyl-1, 4, 8, 11-tetraazamacrocyclotetradecane-N, N"-diacetic acid) were determined by potentiometric titration in 0.5mol/L KCl solution at (25±0.1)℃, (30±0.1)℃ and (40±0.1)℃.The changes of enthalpy and entropy in the coordination reaction of H₂Lwith H⁺ in the solution were given. The stability constants of the complexes of H₂L with La³⁺,Nd³⁺, Pr³⁺, Sm³⁺, Eu³⁺, Gd³⁺, Dy³⁺ and Yb³⁺ were determined by the same method at (40±0.1)℃. The experiment results obtained were discussed.

Key words: Tetraazamacrocycle, Lanthanide complex, Stability constant, Enthalpy

CLC Number:

O614.33

TrendMD:

BI Jian-Hong, ZHAO Xiang-Da, NI Shi-Sheng, XIE Fu-Xin. Thermodynamic Studies on N-Diacetic acid substituted tetraazamacrocycle and Its Lanthanide Complexes[J]. Chem. J. Chinese Universities, 1997, 18(8): 1251.

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Thermodynamic Studies on N-Diacetic acid substituted tetraazamacrocycle and Its Lanthanide Complexes

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