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

E. Tóth, E. Brücher

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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.

Original languageEnglish
Pages (from-to)165-167
Number of pages3
JournalInorganica Chimica Acta
Issue number1-2
Publication statusPublished - Jun 15 1994



  • Azamacrocyclic ligand complexes
  • Contrast agent complexes
  • Gadolinium complexes
  • Lanthanide complexes
  • Stability constants

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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