Solubility and solution thermodynamics of novel pyrazolo chalcone derivatives in various solvents from 298.15 K to 328.15 K
Publication date: 1 March 2019
Source: Journal of Molecular Liquids, Volume 277
Author(s): Shipra Baluja, Asmita Hirapara
Some novel pyrazolo chalcone derivatives have been synthesized and characterization of these synthesized compounds was done by IR, 1H NMR, 13C NMR and mass analysis. The solubility of pyrazolo chalcone derivatives in methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, ethyl acetate and acetonitrile was measured by gravimetric method over a temperature range (298.15 to 328.15) K at atmospheric pressure. The solubility of synthesized compounds is found to increase linearly with temperature. Further, in alcoholic solvents, solubility is maximum in 1-pentanol and minimum in methanol whereas in non-alcoholic solvents, solubility is greater in ethyl acetate and minimum in acetonitrile. The experimental solubility data were correlated with temperature by modified Apelblat and Buchowski-Ksiazczak λh equations. The experimental data and model parameters would be useful for optimizing the process of purification. Some thermodynamic parameters such as dissolution enthalpy, Gibb's free energy and entropy of mixing have also been calculated by Van't Hoff analysis. Further, excess enthalpy of solutions has been calculated using Buchowski-Ksiazczak λh equation.
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