Thermodynamic and Ultrasonic Properties of Ascorbic Acid in Aqueous Protic Ionic Liquid Solutions

Abstract

In this work, we report the thermodynamic and ultrasonic properties of ascorbic acid (vitamin C) in water and in presence of newly synthesized ammonium based protic ionic liquid (diethylethanolammonium propionate) as a function of concentration and temperature. Apparent molar volume and apparent molar isentropic compression, which characterize the solvation state of ascorbic acid (AA) in presence of protic ionic liquid (PIL) has been determined from precise density and speed of sound measurements at temperatures (293.15 to 328.15) K with 5 K interval. The strength of molecular interactions prevailing in ternary solutions has been discussed on the basis of infinite dilution partial molar volume and partial molar isentropic compression, corresponding volume of transfer and interaction coefficients. Result has been discussed in terms of solute-solute and solute-solvent interactions occurring between ascorbic acid and PIL in ternary solutions (AA + water + PIL).

A Comprehensive Study on Molecular Interactions of l-Ascorbic Acid/Nicotinic Acid in Aqueous [BMIm]Br at Varying Temperatures and Compositions: Spectroscopic and Thermodynamic Insights

“…The comparison plots for density of l -ascorbic acid, nicotinic acid, and [BMIm]Br in water are displayed in Figures S1, S2, and S3, respectively. The collected and literature-proclaimed density data for l -ascorbic acid, − nicotinic acid, ,− and [BMIm]­Br − in water assent well with each other. For all the solutions, apparent molar volume, V ϕ , has been deliberated through the use of eq where m is the concentration in molality (mol kg –1 ), M is the molar mass (kg mol –1 ) of the solute, ρ and ρ o are the densities (kg m –3 ) of solution and pure solvent, respectively.…”

“…To validate the correctness of acquired speed of sound data, the empirical and literature-summarized data of speed of sound for l -ascorbic acid, − nicotinic acid, ,, and [BMIm]­Br in water have been examined graphically in Figures S4, S5, and S6, respectively, which are in conformity with each other. Density and sound speed data over the temperature range T = 293.15–318.15 K have been applied for the prudence of apparent molar isentropic compression for various aforementioned concentrations of selected vitamins.…”

“…Pandit et al investigated the physicochemical properties of nicotinic acid in aqueous solutions of sodium malonate, thereby concluding the predominance of ion–solvent interactions in the systems. Thus, a systematic literature survey unveils the investigations on thermodynamic and viscometric properties of vitamins in aqueous and additive aqueous media such as saccharides, sugar alcohols, salts, ionic liquids, and glycols. − ,,− To the best of our knowledge, the thermophysical properties of l -ascorbic/nicotinic acid in aqueous [BMIm]Br have been studied for the first time, and the rationalization of interactions that preside in the solutions has been presented in this article.…”

“…36 Therefore, in this paper, we have studied the molecular interactions of L-ascorbic acid/nicotinic acid with [BMIm]Br. Also, Singh et al 37 examined the thermophysical properties of L-ascorbic acid in aqueous and binary aqueous diethylethanolammonium propionate (ammonium IL) at various temperatures and at ambient pressure. Banipal et al 38 analyzed the interactions of L-ascorbic acid, pyridoxine hydrochloride, nicotinic acid, and thiamine hydrochloride in water at distinct temperatures (288.15−318.15) K. In another article, Singh et al 39 carried out studies on volumetric and acoustic parameters of L-ascorbic acid in aqueous triazolium-based ionic liquid, as a consequence intimating the significance of ILs in medicinal and food industries.…”

Experimental Investigation on Thermophysical Properties of Ammonium-Based Protic Ionic Liquids and Their Potential Ability towards CO2 Capture

“…Recently, ionic liquids have been recognized as promising solvents for CO 2 capture from natural gas. The uniqueness of their properties, specifically their non-detectable vapor pressure, high thermal stability, and high affinity for CO 2, enables ILs to be used as solvents for CO 2 capture at elevated temperatures and pressures [ 13 , 21 , 22 , 23 , 24 , 25 ]. Moreover, the chemical and physical properties of ILs can be altered due to the availability of countless cation and anion combinations.…”