Synthesis and Structural studies of Novel Macro cyclic Ligand Type N2S3 Donor atoms and Its Complexes with Some Transition Metals

Abstract

A  new pentdentate potential ligand HL was prepared by condensation reaction of  2-mercapto-5-methyl-benzene -1,3-dicarboaldahyde II with 1,2–diaminoethylsulfide–1,2–dichloroethene I in presence of methanol as a solvent .The new derivative (HL) was identified on the basis of microelmental analysis, (C.H.N.S), ¹HNMR, ¹³CNMR ,FT- IR and UV-Vis spectroscopies. (HL) has been used as chelating ligand to prepare a new series of first row transition element complexes at pH (6-9) range. The colored solid complexes were isolated and characterized on the basis of (C.H.N.S)elemental analyses, UV-Vis, FT.IR spectroscopy ,as well as the proton and carbon-13 NMR for  Zn,Cd and Hg(II) complexes were recorded to investigate the stereochemistry of the prepared complexes.The results obtained  from elemental , spectral data and magnetic susceptibility revealed  that all complexes were octahedral  geometries of  the general formula ,[MLCl]Cl_n, n=1 for  Cr^III, Fe^III and  n=0 for Mn^II, Co^II ,Ni^II and Cu^II in contrast  Zn^II, Cd^II and Hg^II complexes  were octahedral  of electrolytic behavior  in 1:1 suggesting the  formula [ML(H₂O]Cl  , M= Zn^II, Cd^II, Hg^II .

Keywords -: metal complexes, structural study and polydentate ligands N₂S₃ system