ReVO and ReVNPh complexes with pentadentate benzamidines – Synthesis, structural characterization and DFT evaluation of isomeric complexes

Novel, potentially pentadentate ligands (H3L) for an optimal coordination of {MVO}3+ and {MV(NPh)}3+ cores (M = Re, Tc) have been tailored by a computer-aided procedure. They can be prepared by reactions of 2-aminobenzyliminodiacetic acid diethylester with N,N-[(dialkylamino)(thiocarbonyl)]benzimidoyl chlorides and subsequent hydrolysis. The ligands react with [ReOCl3(PPh3)2] or [Re(NPh)Cl3(PPh3)2] under triple deprotonation and form compounds of the general compositions [ReO(L)] and [Re(NPh)(L)], respectively. The organic ligands occupy the remaining five coordination positions of the {ReO}3+ and {Re(NPh)}3+ cores in all compounds studied. The phenylimido complexes hydrolyze in basic media under formation of their oxidorhenium(V) analogs.

A novel family of pentadentate ligands for nuclearmedical procedures has been developed and optimized by a computer-aided procedure. The resulting SN2O2 ligands form very stable complexes with {ReO}3+ units.Figure optionsDownload as PowerPoint slide