Acoustical and Compressibility Parameters of Glycylglycine−FeCl₃in Aqueous Ethanol Mixture atT= (293.15, 303.15, and 313.15) K

Abstract

Ultrasonic velocity measurement is a reliable procedure that allows quick and easy determination of solvent concentrations in mixtures. This paper presents data of ultrasonic velocities and isentropic compressibilities of (glycylglcyine−FeCl3) in aqueous ethanol mixture at T = (293.15, 303.15, and 313.15) K. Various acoustical parameters were calculated, because of their importance in the study of specific molecular interactions. A less-compressible phase of the fluid and a closer packing of molecules is observed with changes in the intermolecular free length. Quantitative investigation suggests that the mixing of ethanol with an aqueous glycylglycine−FeCl3 solution causes the rupture of hydrogen bonds, with increasing δκS and L f values (where the former represents the change in isentropic compressibility and the latter represents the intermolecular free length). Theoretically computed values of isentropic compressibility in the studied mixture using different models indicate the superiority of the very complex procedure.

Microwave assisted synthesis, characterization and thermoacoustical study of a β-naphthol-guanidine-formaldehyde copolymer resin

“…21 The values of density and viscosity show increasing behaviour with respect to the concentration of solution varying from 0.25% to 1% which may be due to an increase in the number of ions of solute in solution and aggregation of solute molecules supporting strong solute-solvent interaction at that particular concentration. 16,20 Similar trends are also found in the value of acoustical impedance i.e. with the increase in the % concentration of the copolymer solution, the value of acoustical impedance increases but as the temperature increases, the value of acoustical impedance decreases while the value of relative association increases with an increase in the % concentration of solution and shows irregular behaviour with increase in temperature as shown by Fig.…”

“…At the same time, the increase in the value of adiabatic compressibility and intermolecular free length with respect to an increase in temperature indicate that there is breaking of bonds formed between solute-solvent molecules. 20,21 These observations indicate the hydrogen bonding interactions between solute-solvent molecules which are also expected due to the presence of phenolic -OH, amine -NH-and imine QNH groups in the polymer molecules.…”

“…[16][17][18] Recently, these have also been used in medicinal, agricultural, industrial and solution chemistry. 19,20 The measurement of ultrasonic velocity has been used in understanding the physico-chemical behaviour of a particular solute-solvent system present in a polymer solution. 21,22 Ultrasonic velocity measurements are highly sensitive to molecular interactions and can be used to provide qualitative as well as quantitative information about the physical nature and strength of molecular interactions in solute-solvent mixtures.…”

Effect of 1-Ethyl-3-methylimidazolium Bromide Ionic Liquid on the Volumetric Behavior of Some Aqueous l-Amino Acids Solutions

“…The denaturation of a protein in different aqueous solutions containing salts is an important behavior of biological molecules and has been the subject of extensive investigation. − However, the complex configurational and conformational aspects of protein structure in aqueous solution, make it very difficult to directly interpret various biological processes with salts. In recent years, it is recognized that the physicochemical investigations of aqueous solutions containing amino acids − or small peptides − are of considerable importance and will be helpful in the fundamental understanding of denaturation and other complicated biological processes. Among these technologies, volumetric studies − ,− can provide some unique information in terms of ligand-binding properties, as well as the folding/unfolding character and conformational stability of a globular protein. , …”