J. Iran. Chem. Soc., Vol. 7, No. 1 March 2010, pp.195~201.

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Thermodynamic Study of the Interaction of Co(II)-Schiff Base Complexes with Phosphines

M. Asadi*, M. Mohammadikisha and K. Mohammadib

aChemistry Department, College of Sciences, Shiraz University, Shiraz 71454, I. R. Iran
bChemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr 75169, I. R. Iran

The equilibrium constants and the thermodynamic parameters for the interaction of CoLx (L1 = 5-OMe-salabza, L2 = salabza, L3 = 5-Br-salabza and L4 = 5-NO2-salabza) as acceptors, with phosphines (PBu3, PPh2Me) as donors in dichloromethane were studied. This was performed by using UV-Vis spectrophotometry titration for 1:1 adduct formation of the selected complexes at various temperatures (T = 283-298 K). The trend of the adduct formation of the Co(II) complexes with a given phosphine donor decreases as CoL1 > CoL2 > CoL3 > CoL4. The stability of the resulting adducts with different Co(II)-schiff base complexes found to decrease in the order PBu3 > PPh2Me.

Keywords: Cobalt, Schiff base, Equilibrium constant, Thermodynamic parameters

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