Synthesis, Structural ,And Anti bacterial Activity Studies of Some Transition Metal Complexes of New Some Trithiocarbonate Derivatives

The  new  ligands  have  been prepared in this  work  (potassium 2carbomethoxy amino 5-5trithiocarbonate 1,3,4-thiadiazole ) (LI) was prepared from 2-carbomethoxy amino-5-mercapto 1,3,4-thiadiazole  with  CS2 in alkali media , while the second  ligand    was  prepared  from 2-N(4-N,N-dimethylamino benzyliden)-5-mercapto 1,3,4-thiadiazole  with  CS and in alkali media  to obtain potassium 2-N( 4-N,N-dimethylaminobenzyliden )4-trithiocarbonate 1,3,4thiadiazole ( LII).The  products  were  isolated  and  characterized  by  appropriate physical measurement , vibrational and electronic spectroscopy .2 The new ligands have been used to prepare a number of new complexes with the selected metal ions  Cd(II), Cu(II) , Ni(II) , Co(II) , Fe(III) , and Mn(II) . These complexes were studied and characterized using FT,IR, UV-Vis. spectra, molar conductivity, magnetic susceptibility , melting point , and atomic absorption measurement. We concluded that the [CuCl2].2H2O, [Fe2L2(OH)2Cl4] .4H22O and  [Mn LL2Cl22(H (H22O)O)22]. 3C] . 2H22HO have octahedral geometry while [Cd L2]. 3C2H5OH  and  [Co L H2O Cl ].3HO   have tetrahedral25OH,  [Ni L2 geometry for the complexes of LI.While octahedral geometry for the complexes of  LII for the [Cu L2 (H2O)4 Cl2].2H2O , [Mn L2 (H2O) (OAc)].3 HO[Ni L2 (H2O)2 Cl2].C2H5OH , [Fe2 L4 (OH)2].5HO and[Co2L2(H2O)4Cl2]. 2.5 C2H5OH ,But [Cd L222]. 4C2H5OH have tetrahedral geometry Different bonding and structural behavior were revealed through the study of the coordination chemistry of the metal complexes of the new ligands.The  nature  of  bonding  between the metal ion and the donor atom of the ligands were demonstrated through the calculated Racah parameter and the other ligand field parameters,which were calculated using the suitable Tanaba-sugano diagram.The ntibacterial  activity for the  ligands  and  their  metal complexes were studied     against    two   selected   microorganisms     pseudomonas earuginsa    and  staphylococcus   aureus   using ( 10mM )  and  ( 5mM ) concentration  in  nutrient agar medium . The results were showed a great enhancement  of  activity  of  some complexes   relative   to   that of their respective ligands , these were attributed to the synergetic effect between the metal ion and the ligand , in addition to the difference in the structural varieties .