A Study of Solute–Solvent Interaction in Solvents of Medium Dielectric Constant from the Apparent Molal Volume Data. I

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概要

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• A study of the apparent molal volume (φ<SUB>v</SUB>) of some common salts and the tetraalkylammonium iodides in DMSO has been reported in this communication. All the salts studied here, including those containing the larger R<SUB>4</SUB>N<SUP>+</SUP> ions, have a positive slope in the φ<SUB>v</SUB> <I>vs.</I> \sqrt<I>C</I> curves, indicating a strong ionic interaction, apparently due to the medium dielectric constant of the solvent. This dielectric constant also promotes ion-association at higher concentrations and thus mutual penetration of the R<SUB>4</SUB>N<SUP>+</SUP> ions is prevented. As a result, no negative slope in the φ<SUB>v</SUB> <I>vs.</I> \sqrt<I>C</I> curves of the larger R<SUB>4</SUB>N-iodides is observed in this solvent. The effect of temperature on the limiting apparent molal volume, φ°, reveals that the ion-solvent interaction is comparatively stronger in the non-hydrogen bonded solvents like DMSO and DMF than that in strongly hydrogen-bonded solvents like NMA and NMP. Addition of a CH<SUB>2</SUB>-group to each of the four R-chains of the R<SUB>4</SUB>N<SUP>+</SUP> ion increases its volume by about 70 ml per mole in DMSO, DMF, and NMA.

• 公益社団法人 日本化学会の論文

著者

• Kumar Rajendra

  Department of Botany, Christ Church College

• Agarwal D.

  Department of Chemistry, Lucknow University

• Gopal Ram

  Department of Chemistry, Lucknow University

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• Ion-Solvent Interaction of Tetraalkylammonium Ions in Solvents of High Dielectric Constant. II. Conductance and Walden Product of Tetraalkylammonium Ions in N-Methylformamide and N-Methylpropionamide at Different Temperatures

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