The complexation reaction between salicylaldehyde thiosemicarbazone, abbreviated as STSC, with Cu(II) ion was studied in binary mixtures of methanol-1,4-dioxane using UV-Vis spectrophotometric and conductometric methods at different temperatures. The formation constants (K f ) for the 1:1 complex, Cu(II)-STSC, were calculated from computer fitting of the absorbance and molar conductance data against various concentrations ratios (c M :c L or c L :c M ) in different binary solvent mixtures. A non-linear correlation was observed for the variation of log K f for the complex against the solvent compositions. Various thermodynamic parameters (ΔH, ΔS and ΔG) for the formation of the Cu(II)-STSC complex were also determined from the temperature dependence of the formation constants (K f ). The results showed that the complexation reaction is affected by the nature and composition of the mixed solvents.
The complexation reaction between N-salicylidene-2-aminophenol, abbreviated
as SAP, with Cu2+ ion was studied in binary mixtures of methanol and
1,4-dioxane by using conductometric and spectrophotometric method at
different temperatures. The stability constants (Kf) for the 1:1 complex,
Cu2+-SAP, were calculated from computer fitting of absorbance and molar
conductance data against various mole ratios (cM:cL or cL:cM) in different
binary solvent mixtures. A non-linear behaviour was observed for the
variation of logKf for the complex against the solvent compositions. Various
thermodynamic parameters (?H, ?S and ?G) for the formation of Cu2+-SAP
complex were determined from the temperature dependence of stability
constants (Kf). The overall results showed that the complexation reaction is
entropy driven and is affected by the nature and composition of the mixed
solvents.
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