The temperature dependence of the solubilities of 1-phenyl-1,3-butanedione and 4,4,4-trifluoro-1-phenyl-1,3-butanedione in water and aqueous electrolyte solutions.
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The temperature dependence of the solubilities of 1-phenyl-1,3-butanedione (benzoylacetone) and 4,4,4-tri-fluoro-1-phenyl-1,3-butanedione (benzoyltrifluoroacetone) in water and in 1.0 mol l<SUP>−1</SUP> aqueous solutions of HClO<SUB>4</SUB>, HCl, NaClO<SUB>4</SUB>, KCl, NaBr, NaCl, BaCl<SUB>2</SUB>, and Na<SUB>2</SUB>SO<SUB>4</SUB> was determined over the temperature ranges of 20 to 45°C for benzoylacetone and of 15 to 30°C for benzoyltrifluoroacetone. From these data, the thermodynamic quantities associated with the dissolution in water and with the transfer from water to the aqueous electrolyt solutions were estimated. Both the enthalpy and the entropy of solution of benzoyltrifluoroacetone in water were much smaller than those for benzoylacetone. This was interpreted by assuming a higher hydrophobic hydration for the less polar benzoyltrifluoroacetone. The thermodynamic quantities of the transfer of benzoyltrifluoroacetone from water to the aqueous perchloric acid solution showed characteristic features compared with those of the other electrolyte solutions. The overall salt effect on the dissolution of benzoylacetone and benzoyltrifluoroacetone is discussed in terms of the change in the thermodynamic quantities.
- 公益社団法人 日本化学会の論文
著者
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Suzuki Nobuo
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Yoshimura Yasuki
Department of Chemistry, Faculty of Science, Tohoku University
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