Partenaires

CNRS


Rechercher


Accueil > Publications > Recherche par années > Années 2000 > 2005

Balogh, E ; Tripier, R ; Ruloff, R ; Tóth, E

Kinetics of formation and dissociation of lanthanide(III) complexes with the 13-membered macrocyclic ligand TRITA4-

Dalton Transactions 1058-1065

par Administrateur - publié le

Abstract :

The tetraazamacrocyclic ligand TRITA(4-) is intermediate in size between the widely studied and medically used 12-membered DOTA(4-) and the 14-membered TETA(4-). The kinetic inertness of GdTRITA was characterized by the rates of exchange reactions with Zn2+ and Eu3+. In the Zn2+ exchange, a second order [H+] dependence was found for the pseudo-first-order rate constant (k(0) = (4.2 +/- 0.5) x 10(-7) s(-1) ; k’ = (3.5 +/- 0.3) x 10(-1) M-1 s(-1), k" = (1.4 +/- 0.4) x 10(3) M-2 s(-1)). In the Eu3+ exchange, at pH