Lanthanide complexes of ethylenediaminotetramethylene-phosphonic acid

E. Princz, I. Szilágyi, K. Mogyorósi, I. Labádi

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16 Citations (Scopus)


Ethylenediaminotetramethylenephosphonic acid (EDTMP, H8L) was prepared and its complexes with some lanthanide ions (La, Eu, Gd and Sm) were isolated under various conditions. IR spectra and thermal stabilities of EDTMP and its complexes were studied. The experimental conditions of the preparation influence to the composition of the complexes were shown. In alkaline solution (pH=8) deprotonated (P(O)(O-)2), and in acidic solution (pH=3-4) deprotonated and partly protonated (P(O)(O-)(OH)) and non-protonated (P(O)(OH)2) phosphonic groups are present in the complexes. All the complexes contain coordinated water molecules. The complexes containing a protonated phosphonic group contain coordinated and hydrogen-bonded water molecules.

Original languageEnglish
Pages (from-to)427-439
Number of pages13
JournalJournal of Thermal Analysis and Calorimetry
Issue number2
Publication statusPublished - Jan 1 2002


  • Aminophosphonates
  • Ethylenediaminotetramethylenephosphonic acid
  • IR spectra
  • NMR contrast agent
  • Thermoanalytical studies

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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