Orthogonal synthesis of a heterodimeric ligand for the development of the GdIII–GaIII ditopic complex as a potential pH-sensitive MRI/PET probe
作者:Nikolay Vologdin、Gabriele A. Rolla、Mauro Botta、Lorenzo Tei
DOI:10.1039/c2ob27200h
日期:——
A heterodimeric polyaminocarboxylate ligand based on a DO3A-sulfonamide linked to AAZTA (6-amino-6-methylperhydro-1,4-diazepinetetracarboxylic acid) was synthesised via an orthogonal pathway in order to differentiate the two chelating cages and allow the formation of a GdIIIâGaIII heteroditopic complex. The goal is to create a smart MRI/PET probe with pH dependent relaxivity and with the bimodal imaging approach that enables direct quantification of the stimulus, in this case pH. A 1H NMR relaxometric study of the GdâGa heteroditopic complex addressed the pH modulation of the relaxivity and thus its possible use as an MRI pH sensitive probe.