Potentiometric and thermodynamic studies of schiff base hydrazone metal complexes

The synthesis and structural features of some Bidentate Schiff base complexes of the type [M (ONN) 2 ] (where M= Cu+2, Ni+2, Co+2, Mn+2 and O represents the salicylaldehyde moiety) are reported. The ligand was derived by the condensation of Cinnamaldehyde hydrazone with substituted salicylaldehyde. These metal complexes were characterized by elemental analysis, molar conductance, magnetic momentum measurements, IR, 1HNMR spectral data. An octahedral geometry was proposed for all metal complexes. Stability constants of these metal complexes were determined using a potentiometric method at constant ionic strength (0.1m) and at different temperature (250C, 300C, 350C) in 50% v/v ethanol-water mixture by calculating the values of hA, h and PL, it has been found that ligand forms complexes in 1:2 ratio

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