Water-soluble tetraaqua Ln(III) glycinehydroximate 15-metallacrown-5 complexes towards potential MRI contrast agents for ultra-high magnetic field

The tetraaqua lanthanide-copper 15-metallacrown-5 derivatives have been prepared. To assess the potential of Gd(H2O)4[15-MCCu(II)Glyha-5](Cl)3 complex as MRI contrast agent, the relaxivities were measured at 4.7 T, 7 T and 9.4 T high magnetic fields.49