Characterization of Lanthanide(III) DOTP Complexes: Thermodynamics, Protonation, and Coordination to Alkali Metal Ions - Archive ouverte HAL Access content directly
Journal Articles Inorganic Chemistry Year : 1996

Characterization of Lanthanide(III) DOTP Complexes: Thermodynamics, Protonation, and Coordination to Alkali Metal Ions

A. Sherry
  • Function : Author
J. Ren
  • Function : Author
J. Huskens
  • Function : Author
E. Brücher
  • Function : Author
C.F.C.G Geraldes
  • Function : Author
M.M.C.A. Castro
  • Function : Author
W.P Cacheris
  • Function : Author

Abstract

Lanthanide complexes of the tetraazatetrakis(methylenephosphonate) ligand DOTP8- have been examined by spectrophotometry, potentiometry, osmometry, and 1H, 31P, and 23Na NMR spectroscopy. The LnDOTP5- complexes undergo four protonations between pH 9 and 3, and their stability constants (log KML) range from 27.6 to 29.6 across the lanthanide series. TmDOTP5- acts as a particularly good aqueous shift reagent, inducing paramagnetic shifts in 23Na nuclei of over 400 ppm. 23Na NMR titrations and osmometry measurements indicated that a single Na+ was bound to each TmDOTP5- at low Na+/TmDOTP5- ratios, while three Na+ ions were bound at high Na+/TmDOTP5- ratios.

Dates and versions

hal-02080958 , version 1 (27-03-2019)

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A. Sherry, J. Ren, J. Huskens, E. Brücher, Éva Tóth, et al.. Characterization of Lanthanide(III) DOTP Complexes: Thermodynamics, Protonation, and Coordination to Alkali Metal Ions. Inorganic Chemistry, 1996, 35 (16), pp.4604-4612. ⟨10.1021/ic9600590⟩. ⟨hal-02080958⟩
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