Ultrasonic Velocity and Compressibility Studies of Tetraalkylammonium Salts in Acetonitrile + Methanol Binary Mixtures at 298.15 K
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Abstract
The ultrasonic velocities (u) and densities (ρ) of tetraalkylammonium perchlorates (R4NClO4, where R = Methyl, Ethyl, Propyl or Butyl) and tetrabutylammonium tetraphenylborate (Bu4NPh4B) solutions have been measured at different salt concentrations in the range (30–500) × 10−4 mol kg–1 in binary mixtures of acetonitrile (AN) with methanol (MeOH) containing 0, 20, 40, 60, 80 and 100 mol % methanol at 298.15 K. The isentropic compressibilities (Ks) and apparent molal isentropic compressibilities (Ks,φ) of different salts in the solvent mixtures have been calculated. Limiting apparent molal isentropic compressibilities (Kos,φ) for various salts have been evaluated and split into contributions of individual ions i.e., into (Kos,φ)± values. The variation of (Kos,φ)± values with solvent composition shows that Bu4N+ and Ph4B+ have very large positive (Kos,φ)± values which show strong solvophobic interactions in AN and in AN + MeOH mixtures over the entire solvent composition range. These positive values indicate some special type of interactions with the solvent molecules, which increase with the increase of MeOH composition. ClO4– shows much weaker solvation in AN + MeOH mixtures by having some interaction with AN in the AN rich region of the mixtures. The negative values of Me4N+ and Et4N+ ions show strong structural effects which arise due to solute-solvent interactions in MeOH rich region of mixtures.
©2015 Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Review Article
- Application of Polarization Modulation Infrared Reflection Absorption Spectrosocpy Under Electrochemical Control for Structural Studies of Biomimetic Assemblies
- Ultrasonic Velocity and Compressibility Studies of Tetraalkylammonium Salts in Acetonitrile + Methanol Binary Mixtures at 298.15 K
- The Au-PANI System. Synthesis and Catalytic Properties of Nanogold
- Synthesis of Azo Polyurethane-Urea and Investigation of its Thermo-Optic Properties
- Structure and Internal Dynamics of Acid K Salt of (E)-2-hydroxyimino-2-cyanoacetic Acid Ethyl Ester
- Interfacial Dilational Rheology of the Novel Zwitterionic Surfactants
- A DFT Study of CO and NO Adsorptions on AlN-, AlP-, and ZnO-doped Graphene Nanosheets
- Theoretical Studies Regarding the Aromaticity of Some Non-Planar Circulenes
Artikel in diesem Heft
- Frontmatter
- Review Article
- Application of Polarization Modulation Infrared Reflection Absorption Spectrosocpy Under Electrochemical Control for Structural Studies of Biomimetic Assemblies
- Ultrasonic Velocity and Compressibility Studies of Tetraalkylammonium Salts in Acetonitrile + Methanol Binary Mixtures at 298.15 K
- The Au-PANI System. Synthesis and Catalytic Properties of Nanogold
- Synthesis of Azo Polyurethane-Urea and Investigation of its Thermo-Optic Properties
- Structure and Internal Dynamics of Acid K Salt of (E)-2-hydroxyimino-2-cyanoacetic Acid Ethyl Ester
- Interfacial Dilational Rheology of the Novel Zwitterionic Surfactants
- A DFT Study of CO and NO Adsorptions on AlN-, AlP-, and ZnO-doped Graphene Nanosheets
- Theoretical Studies Regarding the Aromaticity of Some Non-Planar Circulenes
