Apparent molal volumes of urea derivatives in water-methanol mixtures.

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概要

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• Apparent molal volumes (φ<SUB>v</SUB>) at 25 °C have been obtained for the following urea derivatives in water–methanol mixtures from measurements of the density using an Anton Paar digital densimeter: urea (U), methylurea (MU), ethylurea (EU), 1,1-dimethylurea (1,1-DMU), 1,3-dimethylurea (1,3-DMU), 1,1-diethylurea (1,1-DEU), and 1,3-diethylurea (1,3-DEU). The limiting values φ<SUB>v</SUB><SUP>°</SUP> were calculated by linear extrapolation using the least-squares method. A plot of φ<SUB>v</SUB><SUP>°</SUP> vs. <I>X</I><SUB>2</SUB>, the mole fraction of methanol, showed a minimum for each alkylurea studied at low methanol concentrations (<I>X</I><SUB>2</SUB>\simeq0.1), but none for unsubstituted urea: the more alkyl-substituted the urea was, the sharper the minimum. Inspection of the data shows that the assumption of independent solvation on both sides of the urea molecules also holds to a good approximation to the apparent molal volumes both in the pure solvents and in the mixtures.

• 公益社団法人 日本化学会の論文

著者

• Mizutani Kiyoshi

  Department of Chemistry, College of General Education, Nagoya University

• Yasuda Motoo

  Department of Chemistry, College of General Education, Nagoya University

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• Volume and adiabatic compressibility of amino acids in urea-water mixtures.
• Apparent molal volumes of urea derivatives in water-methanol mixtures.

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