Abstract
Proton-ligand stability constants of five Schiff bases, derived from 4-(p-bromophenyl)-2-aminothiazole and R substituted salicylaldehyde (R = H, 5-CH 3 , 4-CH 3 and 5-Br) or 2-hydroxy-l-naphthaldehyde, and formation constants of their transition metal (Co, Ni, Cu and Zn) complexes have been determined pH-metrically at room temperature (25 °C) and at constant ionic strength, 1 = 0.1 M (NaClO 4 ), in 75: 25% (v/v) ethanol-water medium using Calvin-Bjerrum pH-technique as adopted by Irving-Rossotti. The order of stability constants of the complexes has been proposed, which is in accordance with the order suggested by Irving-Williams. The effect of elevated temperature (35 °C and 45 °C) on the determination of formation constants of metal complexes has been studied. Decrease in value of formation constant of the complex with increase in temperature indicates that low temperature is favorable for complex formation. The thermodynamic parameters (AG, ΔH and AS) at different temperatures have been calculated.
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