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.
- Ethylenediaminotetramethylenephosphonic acid
- IR spectra
- NMR contrast agent
- Thermoanalytical studies
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry