Abstract
The interactions between eight water insoluble substances and sodium benzoate derivatives in aqueous solutions were studied spectrophotometrically. It was found that the water insoluble substance used formed one to one molecular complex with sodium benzoate derivative in aqueous system. The formation constants of the complexes were determined at 25° and 60°, with which the enthalpy change ΔH and the entropy change ΔS of complex formation were obtained. As a result, it was suggested that the driving force of the complex formation would be due to charge transfer force or hydrogen bonding.
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