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Toth, E ; Burai, L ; Merbach, AE

Similarities and differences between the isoelectronic Gd-III and Eu-II complexes with regard to MRI contrast agent applications

Coordination Chemistry Reviews 216 363-382

par Administrateur - publié le

Abstract :

In solution, the [Eu-11(DTPA)(H2O)](3-). [Eu-11(DOTA)(H2O)](2-). [Eu-11(ODDM)(2-) and [Eu-11(ODDA)(H2O)] complexes are less stable towards oxidation than [Eu(H2O)(8)](2+), as shown by their redox potentials (E-1/2 = - 1.35, - 1.18, - 0.92, - 0.82 and - 0.63 V versus Ag / AgC1 electrode, respectively) (DTPA(5) = diethylenetriamine-N,N,N ’ ,N " ,N " -pentaacetate, DOTA(4) = 1,4,7,10-tetraazacyclododecane-1,4,7,10-tertraacetate, ODDM2 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-diacetate). In the solid state, the [Eu-11(DTPA)(H2O)](3-) complex is nine-coordinate with one inner-sphere water molecule.