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Costa, J ; Balogh, E ; Turcry, V ; Tripier, R ; Le Baccon, M ; Chuburu, F ; Handel, H ; Helm, L ; Tóth, E ; Merbach, AE

Unexpected aggregation in aqueous solution of neutral, xylene-cored dinuclear GdIII chelates in aqueous solution

Chemistry-A European Journal 12 (26) 6841-6851

par Administrateur - publié le

Abstract :

We have synthesized ditopic ligands L-1, L-2, and L-3 that contain two DO3A(3-) metal-chelating units with a xylene core as a noncoordinating linker (DO3A(3-) = 1,4,7,10-tetraazacyclododecane-1,4,7-triacetate ; L-1 = 1,4-bis[4,7,10-tris(carboxymethyl)-1,4,7,10- tetraazacyclododecane-1-yl]methyl-2 benzene ; L-2 = 1,3-bis[4,7,10-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane-1-yl]methylbenzene ; L 3 = 3,5bis[4,7,10-tris(carboxymethyl)-1,4,7,10- tetra azacyclododecane-1-yl]methylbenzoic acid). Aqueous solutions of the dinuclear Gd-III complexes formed with the three ligands have been investigated in a variable-temperature, multiple-field O-17 NMR and H-1 relaxivity study.