Synthesis and characterization of polydentate macrocyclic Schiff bases (18-membered atoms) and their complexes with cobalt (II), nickel (II), copper (II) and zinc (II) ions

The condensation reactions of [2+2] carbohydrazide or thiocarbohydrazide with 2, 5-hexanedione in a (1:1) molar ratio in aqueous solution at room temperature resulted in the formation of the novel Schiff bases tetraimine, macrocyclic ligands ( L1) : 2,5,11,14-Tetramethyl-8 , 17-dione-1,6,7,9,10,15,16,18octaaza-cyclo octadeca-1,5,10,14 Tetraene and ( L2 ) : 2,5,11,14-tetramethyl– 8,17 –dithione-1,6,7,9,10,15,16,18 -octaaza-cyclo octadeca-1,5,10,14 tetraene.Mononuclear , complexes with the compositions [Co(L1)Cl ] Cl.H2O; [M(L1)]Cl2.nH2O (M = Ni (II), Cu (II) or Zn (II); n = 0 when M = Zn (II) and n = 1 when M = Cu (II) and n=2 when M=Ni (II)); [M (L2 )Cl2]; (M=Co (II), Ni (II) or Cu (II); and [Zn(L2 )]Cl2 were obtained by reacting metal (II) chlorides with the ligand (L1) or ( L2 ) in (1:1) molar ratio in ethanol. Mass, HNMR 1 and infrared spectral techniques suggest the structural features of 18-membered [2+2] Schiff base macrocyclic ligands while the nature of bonding and the stereochemistry of the complexes have been deduced by elemental contents analyses, molar conductance and magnetic susceptibility measurements, IR, MS , HNMR 1 and electronic spectral studies. The magnetic moments and electronic spectral data suggested tetrahedral geometries for the [Co(L1)Cl ].H2O and [Co(L2)Cl2] complexes ; octahedral geometries with coordination number six for the complexes [Ni(L )]Cl2.2H2O, [Zn(L1 )]Cl2 , [Ni(L2 )Cl2] , [Cu(L2 )Cl2] and [Zn(L2 )]Cl2 while a square planar suggested for the [Cu(L1 )]Cl2.H2O complex.

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