Stability constants of the lanthanide(III)-1,4,7,10-tetraazacyclododecane-N,N′,N″,N‴-tetraacetate complexes

É. Tóth (1) , E. Brücher

1 University of Debrecen Egyetem [Debrecen]

The stability constants of the LnDOTA- complexes have been determined by spectrophotometry at 37 °C in 1.0 M NaCl. The log K values of CeDOTA− and EuDOTA− were obtained by a direct method using the UV absorption of Ce3+ and Eu3+. For the other lanthanides log K values were obtained from the study of the competition reaction between the Ln3+ ion and the Ce3+ or Eu3+ ion for DOTA. The stability constants increase with the decrease in the ionic size between La3+ and Eu3+, while for the heavier lanthanides the log K values are practically constant.

Domaines: Sciences du Vivant [q-bio]

É. Tóth, E. Brücher. Stability constants of the lanthanide(III)-1,4,7,10-tetraazacyclododecane-N,N′,N″,N‴-tetraacetate complexes. Inorganica Chimica Acta Reviews, 1994, 221 (1-2), pp.165-167. ⟨10.1016/0020-1693(94)03964-X⟩. ⟨hal-02081015⟩