Synthesis and Characterization of Novel Tetradentate Macrocycle Ligand Type N4 (1,5,8,12 - tetraazacyclotetradecan – 6,7,13,14 -tetraone)and its Complexes with Co(II), Ni(II), Cu(II) and Zn(II)

الملخص

       The ligand (1,5,8,12–tetraazacyclotetradecan-6,7,13,14-tetraone) (H₄L) prepared from reaction diethyl oxalate with 1,3-diaminopropane .This ligand  was reacted with some metal ions (Co^(II), Ni^(II), Cu^(II) & Zn^(II)) in N,N-dimethylformamide (DMF)  to give a series of new complexes in the general formula  [M(H_n L)]^x , where: ( M = Co^(II) , Ni^(II), n = 0 , x = -2) ; (M = Cu^(II) , Zn^(II), n = 1 , x = -1) . All compound have been characterized by spectroscopic methods [I.R,UV-Vis , Atomic absorption] , Elemental analysis and molar conductivity measurements. From the above data the proposed molecular structure for  [Co(L)]^-2 and  [Ni (L)]^-2 is square planar structure , while the rest complexes [Cu (HL)]^- and [Zn (HL)]^- give a tetrahedral structure.