Preparation and characterization of new Sm(III) complexes with some bidentate ligands contains (N,N), (S,N), (O,O) and (N,O) donor atoms

New Sm(III) complexes with heterocyclic bidentate ligands namely imidazole, oxothioazolidine-4-carboxylic acid, N,N-ethylene thiourea, l-cystien, thiobarbituric acid, and thenoyltrifluroacetone have been synthesized. The new complexes have been subjected to characterization using combination of different physico-chemical techniques including spectroscopic (IR, NMR, Ms, UV–Vis), thermogravimetric methods. Electrophoresis and micro-analytical techniques have also used. The charge densities on the ligand atoms were calculated via DFT calculations. The complexes were synthesized by direct reaction between SmCl3 and bidentate ligands contains (N,N), (S,N), (O,O) and (N,O) donor atoms. The investigated complexes were soluble in polar solvents, and could be use as potential radiopharmaceuticals complexes. The antibacterial activities of the investigated complexes have been tested and evaluated.