Synthesis, And Characterization Of Five New Metal Transition Complexes Derived From The Schiff Base Ligand N' 1 ,N' 4 -Bis(2- Hydroxybenzylidene)Succinohydrazide (H4L)

Abstract

Schiff base ligand N'1 ,N'4 -bis(2-hydroxybenzylidene)succinohydrazide (H4L) was synthesized via condensation of salicylaldehyde and succinohydrazide in ethanol. The complexes were obtained from 1:2:1 (H4L/LiOH/MCl2 .nH2O) molar ratio reactions, yielding compound formulated as [M2(H2L)2] .nH2O, where M=Mn(II, Fe(II), Co(II), Ni(II) and Cu(II). Elemental analysis, 1H and 13C NMR, FT-IR and UV-Visible spectroscopies were used for the characterization of the ligand. The complexes were structurally studied using FT-IR, UV-Visible spectroscopies, conductance, and magnetic susceptibility measurements. All complexes are non-electrolytes in DMF solutions. In each complex unit two ligand molecules acting in hexadentate fashion bridges two metal ions are present. Thus, each metal ion of the binuclear unit is coordinated to two azomethine nitrogen atoms, two phenolate oxygen atoms and two carbonyl oxygen atoms, resulting in a hexacoordinated metal ion. The environment around each metal ion is described as octahedral geometry owing to the results of the magnetic susceptibility measurement and the UV-visible spectra analyses.