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  Global Journal of Inorganic Chemistry. Volume 1, Issue 2 (2010) pp. 132-138
  Research Article
 
New transition metal complexes with N2S2 macrocyclic Schiff-base
  Mohamad J. Al-Jeboori*, Fatin N. Al-Azawi, Alla'a H. M. Al-Amiri  
     
Department of Chemistry, College of Education, Ibn Al-Haitham, University of Baghdad P. O. 4150, Adamiyah, Baghdad, Iraq
   
  Abstract  
 

The new macrocyclic Schiff-base (2Z,7E,11E)-2,3-dichloro-8,11-dimethyl-1,4-dithia-7,12-diazacyclotetredeca-2,7,11-triene and its metal complexes with Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) are reported. The reaction of tetrachloroethene with 2–mercaptoethylammonium chloride in mole ratios of 1:2 in the presence of methanolic potassium hydroxide gave the precursor (Z)-2,2`-(1,2-dichloroethene-1,2diyl)bis(sulfanediyl)diethanamine W. Condensation reaction of precursor with 2,5–hexanedione in mole ratios of 1:1 gave the new N2S2 macrocyclic Schiff-base L. Upon complex formation, the ligand behaves as a neutral tetradentate species forming monomeric complexes of general formulae [CrIII(L)Cl2]Cl, [MnII(L)Cl2], [NiII(L)(H2O)2]Cl2 and [MII(L )]Cl2 (M = Fe(II), Co(II), Cu(II), Zn(II) or Cd(II)). The mode of bonding and overall geometry of the complexes were determined through IR, UV-Vis, NMR, and mass spectral studies, magnetic moment measurements, elemental analysis, metal content, and conductance. These studies revealed octahedral geometries for the Cr(III), Mn(II) and Ni(II) complexes, square planar for Cu(II) complex and tetrahedral for the Fe(II), Co(II), Zn(II) and Cd(II) complexes.

     
  Keywords  
  Macrocyclic Schiff-base ligand; (2Z,7E ,11E )-2,3-Dichloro-8,11-dimethyl-1,4-dithia-7,12-diazacyclotetredeca-2,7,11-triene; Metal complexes; Structural study  
     
   
   
   
   
     

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