S YNTHESIS and characterizations of new Mn(II), Co(II), Ni(II), Cr(III) and Fe(III) mela- tonin drug complexes have been studied.The melatonin ligand act as a monodentate ligand through nitrogen of the deprotonated -NH pyrrole ring.This was confirmed by infrared spectra and microanalytical analysis.The magnetic moments data approved the complexity of Mn(II), Co(III), Ni(III) as a square planar and...