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Burai, L ; Toth, E ; Seibig, S ; Scopelliti, R ; Merbach, AE

High-pressure NMR kinetics, part 95 - Solution and solid-state characterization of Eu-II chelates : A possible route towards redox responsive MRI contrast agents

Chemistry-A European Journal 6 (20) 3761-3770

par Administrateur - publié le

Abstract :

We report the first solid state X-ray crystal structure for a Eu-II chelate, [C(NH2)(3)](3)[Eu-II(DTPA)(H2O)]. 8H(2)O, in comparison with those for the corresponding Sr analogue, [C(NH2)(3)](3)[Sr(DTPA)(H2O)]. 8H(2)O and for [Sr(ODDA)]. 8H(2)O (DTPA(5-) = diethylenetriamine-N,N,N’,N " ,N " -pentaacetate, ODDA(2-) = 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-diacetate). The two DTPA complexes are isostructural due to the similar ionic size and charge of Sr2+ and Eu2+. The redox stability of [Eu-II(ODDA)(H2O)] and [Eu-II(ODDM)](2-) complexes has been investigated by cyclovoltammetry and UV/Vis spectrophotometry (ODDM4- = 1,4,10,13-tetraoxa-7,16-diaza-cyclooctadecane-7,16-dimalonate).