J. Iran. Chem. Soc., Vol. 7, No. 4 December 2010, pp.875~882.

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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. Asadia,* and M. Setoodeh Khaha

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

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