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Platas-Iglesias, C ; Corsi, DM ; Vander Elst, L ; Muller, RN ; Imbert, D ; Bunzli, JCG ; Toth, E ; Maschmeyer, T ; Peters, JA

Stability, Structure and Dynamics of Cationic Lanthanide(III) Complexes of N,N´-Bis(propylamide)ethylenediamine-N,N´-diacetic acid

Dalton Transactions (4) 727-737

par Administrateur - publié le

Abstract :

The cationic [Ln(EDTA-PA(2))](+) complexes (EDTA-PA(2) = EDTA-bispropylamide) have been characterised by a multinuclear NMR study. Y-89 and C-13 NMR data indicate the formation of 1 : 1 and 1 : 2 (Ln : ligand) complexes in aqueous solution. The stability constants of these complexes, as determined by potentiometric measurements, are log K-GdL = 10.3 and log K-GdL2 = 14.3. C-13 Relaxation times of the Nd3+ complex show hexadentate binding of the organic ligand via the two amines, the two carboxylates and the two amide oxygen atoms. The complexes are present in solution as a mixture of three isomers : two trans forms and a cis one.