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Some New Unsymmetrical Diimino Tetradentate Schiff Base Derived from 3,4-Diaminobenzophenone: Synthesis, Characterization and the Formation Constant of Ni(II) and Cu(II) Complexes

M. Asadi^a,* and M. Setoodeh Khah^a

^aChemistry Department, College of Sciences, Shiraz University, Shiraz 71454, I. R. Iran

Some new unsymmetrical diimino tetradentate Schiff bases derived from 3,4-diaminobenzophenone, (N-salicyliden-N'-5-OMe.salycyliden)-3,4-diaminobenzophenone (H₂sal-5-OMe.sal.dabp) (H₂L¹), (H₂sal-5-Br.sal.dabp) (H₂L²), (H₂sal-5-Cl.sal.dabp) (H₂L³) and (H₂sal-5-NO₂.sal.dabp) (H₂L⁴) and their Ni(II) and Cu(II) complexes were synthesized and characterized by elemental analysis, IR, ¹H NMR, UV-Vis spectra and mass spectra. The thermodynamic formation constants of the complexes were determined spectrophotometrically at constant ionic strength (0.1 M NaClO₄) at 25 �°C in DMF and their free energies of formation were calculated at 25 �°C.

Keywords: Formation constant, Free energy, Metal complex, Thermodynamic, Unsymmetrical Schiff base