COMPARSION OF THERMODYNAMIC PARAMETERS BETWEEN Ni(II)-Glycinamide AND W(VI)-Glycinamide COMPLEXES IN pH=4.0, I=0.1molL-1

The formation constants of Ni(II)-Glycinamide and W(VI)-Glycinamide systems were determined in buffer solutions, pH=4.0(I=0.1molL-1 in NaClO4 at 10, 15, 20, 25, 30°C) using UV-Visible spectrophotometricmethod. The formation constants were determined by analyzing optical absorption spectra of complexes at variousglycinamide concentrations using SQUAD software.Determining the formation constants at various temperaturesenabled us to calculate some thermodynamic parameters as K, ΔG°, ΔH° and ΔS° related to the considered complexes. With comparsion of between Ni(II)-Gly and W(VI)-Gly, we understand (ΔH°T)Ni(II)-Gly>(ΔH°T)W(VI)-Gly, (ΔS°T)Ni-Gly>(ΔS°T)W-Gly and (ΔG°T)Ni-Gly>(ΔG°T)W-Gly

Keywords:

Formation constants , UV-Visible , Spectrophotometric method , SQUAD , Thermodynamic parameters , Optical absorption