Tc(V) and Re(V) complexes with Mercaptoacetylglysine (MAG₁

Mercaptoacetyl glycine (MAG₁) (1) forms, in the presence of appropriate monodentate ligands, tridentate/monodentate (3+1) coordinated complexes with Tc(V) and Re(V). Exchange of the chlorine by monodentate ligands in [MO(MAG₁)Cl]^- (2) gives access to new mixed-ligand complexes [MO(MAG₁)(XR)] (3) . Some representatives have been prepared and characterized by elemental analysis, ir and uv spectroscopy and EXAFS. Thiobenzoate as monodentate ligand gives the complex (4) that, after debenzoylation, reacts with halogen containing compounds under displacement of the halogen by a [MO(SNO)S] moiety.