Kosmotropic and chaotropic behavior of hydrated ions in aqueous solutions in terms of expansibility and compressibility parameters

Investigations to Explore Molecular Interactions and Sweetness Response of Polyhydroxy Compounds with Amino Acids in Aqueous Systems

“…The plots of Ø V against molality are presented in Figures –, which reveal that an increase in Ø V values with the rise in temperature indicates that greater interactions occur in solutions. A positive increase in Ø V values leads to the formation of cavities in the structure …”

“…The apparent molar volume Ø V values of mixtures give understanding about molecular interactions existing among the particles of solution mixtures. Greater values of Ø V at high concentration and temperature also suggest for greater molecular interactions in solution mixtures, while at lower temperature solute molecules have less space to take in themselves with solvent molecules . Similarly, at higher concentration of solute, more solute–solvent interactions are observed because the solvent molecules do not directly attach to the solute surface through hydrogen bonding, hence generating the gap among solution molecules that leads to positive change in apparent molar volume .…”

“…Figures – represent the negative decreasing trend due to compatibility of the structure . The investigated solutions have a negative decreasing trend with concentration and temperature for aqueous sugar alcohol and aqueous l -arginine systems because of the development of the complex arrangement in solutions. , From measured data of Ø k , the apparent molar compressibility at infinite dilution is known as partial molar compressibility Ø k 0 and is calculated as Ø italick 0 = Ø italick + S italick m where Ø k 0 stands for partial molar compressibility, S k stands for the experimental slope, and m is molality of solution. Calculated data of Ø k 0 are stated in Table .…”

“…The partial molar expansibility is used to probe the molecular associations in various systems and can be explained in terms of structure-making or structure-breaking ability of solute components in solutions, and the following equation is used to express the variation of Ø V 0 at different temperatures: , Ø italicV 0 = a + b T + c T 2 where a , b , and c are fitting coefficients of eq and are reported in Table .…”

“…Greater values of Ø V at high concentration and temperature also suggest for greater molecular interactions in solution mixtures, while at lower temperature solute molecules have less space to take in themselves with solvent molecules. 17 Similarly, at higher concentration of solute, more solute–solvent interactions are observed because the solvent molecules do not directly attach to the solute surface through hydrogen bonding, hence generating the gap among solution molecules that leads to positive change in apparent molar volume. 19 The trends of Ø V in solutions of galactitol in aqueous l -arginine and water (0.06 mol kg –1 l -Arg > 0.04 mol kg –1 l -Arg > 0.02 mol kg –1 l -Arg > water) are noted.…”