Vanillin Schiff bases: Molecular interactions in methanol and THF solutions

Abstract

SummaryDensity, ultrasonic velocity and viscosity of some vanillin Schiff bases derivatives have been studied in methanol and tetrahydrofuran (THF) at 308.15 K. From the experimental data, various acoustical parameters such as isentropic compressibility (κ s ), Rao's molar sound function (R m ), Van der Waals constant (b), relaxation strength (r), intermolecular free length (L f ), apparent molar compressibility, etc. have been evaluated, which helps in understanding the molecular interactions occurring in these solutions.Keywords: Vanillin Schiff bases, ultrasonic Study, acoustical parameters, methanol, THF. ResumenBases de Schiff de vainillina: interacciones intermoleculares en soluciones de metanol y THF En este trabajo se estudiaron la densidad, la velocidad ultrasónica y la viscosidad de soluciones de algunas bases de Schiff derivadas de la vainillina en metanol y tetrahidrofurano (THF) a 308,15 K. A partir de los datos experimentales, se evaluaron diversos parámetros acústicos, como la compresibilidad isentrópica (κ s ), la función acústica molar de Rao (R m ), la constante de Van der Waals (b), la fuerza de relajación (r), la longitud intermolecular libre (L f ), la compresibilidad molar aparente, etc., todo lo cual ayuda a comprender las interacciones moleculares que ocurren en estas soluciones.

Acoustical Investigation of N–(2-hydroxybenzylidene)-3-Substituted Pyridine -2- Amine Schiff bases by Ultrasonic Velocity Measurements in Dioxane at Different Temperatures

“…Ultrasonic technology has been adequately employed to investigate the properties of any substance to understand the nature of molecular interactions in pure liquid [4], liquid mixtures [5][6][7] and ionic interactions in electrolytic solutions [8]. As ultrasonic technique can reveal very weak intermolecular interactions due to its useful wavelength range, many researchers have made important advancements in understanding the nature of molecular interaction and physicochemical behavior of liquid mixtures by studying the acoustics at different concentrations and temperatures and results were interpreted in terms of solutesolvent and solvent-solvent interaction [9][10][11][12][13][14][15][16][17][18].…”