Partial Molar Volumes Of Transfer Research Articles

Densities and Speeds of Sound of d(+)-Glucose, d(−)-Fructose, d(+)-Xylose and d(−)-Ribose in Aqueous Tripotassium Citrate Solutions at Different Temperatures

Apparent molar volumes (Vϕ) and apparent molar isentropic compressions (Kϕ,S) for some monosaccharides {d(+)-glucose, d(−)-fructose, d(+)-xylose and d(−)-ribose} in (0.0, 0.2, 0.4, 0.6) mol·kg–1 aqueous solutions of tripotassium citrate (TPC) have been determined from density and speeds of sound measurements along four isotherms at temperatures between (288.15 and 318.15) K at experimental pressure p = 0.1 MPa using an automated vibrating tube densimeter (Anton Paar DSA 5000 M). The experimental values are used to determine partial molar volume (Vϕ0), partial molar isentropic compression (Kϕ,S0) at infinite dilution and their corresponding partial molar volumes of transfer (ΔVϕ0), and partial molar isentropic compression of transfer (ΔKϕ,S0). The expansibility parameter (∂Vϕ0/∂T)P and its derivative (∂2Vϕ0/∂T2)P along with pair (VAB, KAB) and triplet (VABB, KABB) interaction coefficient for density and speed of sound data have been determined. The interpretation of the data has been made in terms of solut...

Newlight Technologies to use AirCarbon biocatalysis technology to convert methane

From the measurements of density and speed of sound, the apparent molar properties and the partial molar properties have been determined to study the interactions of two polyethylene glycols i.e. polyethylene glycol 400 and polyethylene glycol 4000 in aqueous solutions of sorbitol at experimental pressure p = 0.1 MPa and temperatures T = (288.15–318.15) K. Evaluation of partial molar volume (Vϕo), apparent molar volume (Vϕ) and partial molar volumes of transfer (ΔVϕo) is done using density measurements. For the determination of partial molar isentropic compression (Kϕ, so), apparent molar isentropic compression (Kϕ, s), and partial molar isentropic compression of transfer (ΔKϕ, so), the ultrasonic speed measurements have been utilized. The limiting apparent molar expansibilities (Eϕ0) and its first order derivatives (∂Eϕ0/∂T)p are also calculated. Further, with the aid of partial molar isentropic compression of transfer and partial molar volumes of transfer, pair and triplet coefficients are determined. Through the scrutiny of these evaluated parameters, the results are elucidated based upon contending patterns of physicochemical interactions of co-solutes and solvents prevailing in present ternary liquid mixtures.

Volumetric property of glycine, l-serine, l-alanine and l-proline in aqueous solutions of 1-phenylpiperazinium tetrafluoroborate

The densities of aqueous solutions of glycine, l-serine, l-alanine, l-proline with the ionic liquid (IL), 1-phenylpiperazinium tetrafluoroborate ([Phpi][BF4]) at the IL concentrations of (0.025, 0.055 and 0.100) mol·kg−1 have been measured at the temperatures of (298.15, 303.15 and 308.15)K. On the basis of the experimental results, the apparent molar volume (VФ), standard partial molar volume (VФ0), transfer partial molar volume (ΔtrVΦ0) and hydration number (nH) have been calculated. The hydrophilic–hydrophilic, hydrophobic–hydrophilic and hydrophobic–hydrophobic interactions are involved in the studied systems of {[Phpi][BF4]+amino acids+H2O. These volumetric parameters can help to understand the mixing effects and other complex biological processes between amino acids and ionic liquid aqueous solution.

Effect of 1-Butyl-3-methylimidazolium Ibuprofenate as an Active Pharmaceutical Ingredient Ionic Liquid (API-IL) on the Thermodynamic Properties of Glycine and l-Alanine in Aqueous Solutions at Different Temperatures

Recently, ionic liquids have been combined with active pharmaceutical ingredients (APIs), and a third generation of ILs has emerged (API-ILs). The effect of a novel ionic liquid containing the ibuprofenate anion as an active pharmaceutical ingredient ionic liquid (API-IL) on the thermodynamic properties of two amino acids, glycine and l-alanine, have been studied. The densities, speeds of sound, viscosities and refractive indices of glycine and l-alanine in water and in aqueous solutions of an API-IL, 1-butyl-3-methylimidazolium ibuprofenate ([BMIM][Ibu]), have been determined at temperatures 288.15–318.15 K. The measured data have been used to calculate the standard partial molar volume $$ V_{\phi }^{0} $$ , partial molar volume of transfer $$ \Delta_{\text{tr}} V_{\phi }^{0} $$ , Hepler’s constant $$ (\partial^{2} V_{\phi }^{0} /\partial T^{2} )_{p} $$ , apparent molar isentropic compressibility $$ \kappa_{\phi } $$ , molar refraction R D, viscosity B coefficient (B) and hydration number parameters n H. All of these parameters are discussed in terms of the competitive interactions occurring between amino acids–[BMIM][Ibu] and amino acids–water.

Volumetric Properties and Viscosity B-Coefficients for the Ternary Systems Epigallocatechin Gallate + MCl + H2O (M = Li, Na, K) at Temperatures 288.15–308.15 K

Epigallocatechin gallate (EGCG) is the most abundant and active components in tea. In this text, the density and viscosity of ternary aqueous solution of EGCG containing LiCl/NaCl/KCl were determined at temperatures ranging from 288.15 to 308.15 K at atmospheric pressure. The density data was used to compute the apparent molar volumes (Vφ), limiting partial molar volumes (Vφ0), and transfer partial molar volumes (ΔtrsVφ0). The viscosity B-Coefficients were calculated from the measured viscosity data using the extended Jones–Dole equation. The values of density and viscosity increased continuously with the increasing of molality of EGCG and decreased with the temperature increasing. The positive values including (Vφ, Vφ0, ΔtrsVφ0, viscosity B-Coefficients, the free energies of activation for solvent Δμ10≠, and for solute Δμ20≠) and Helper’s constant (∂2Vφ0/∂T2)p close to zero indicated the presence of strong solute–solvent interactions and the structure–making effect of EGCG in the investigated solutions. ...

Volumetric, ultrasonic and UV absorption studies on interactions of antibiotic drug chloramphenicol with glycine and its dipeptide in aqueous solutions at T = (288.15–318.15) K

The interactions of the drug chloramphenicol with glycine and its dipeptide i.e. glycylglycine have been investigated in aqueous medium from density (ρ) and speed of sound(c) measurements at T=(288.15, 298.15, 308.15, 318.15)K and experimental pressure p=0.1MPa. The apparent molar volume (Vϕ), the partial molar volume (Vϕo) and standard partial molar volumes of transfer (ΔVϕo) for glycine and its dipeptide, from water to aqueous chloramphenicol have been calculated from density values. The limiting apparent molar expansibilities have also been calculated. The apparent molar isentropic compression (Kϕ,s), partial molar isentropic compression (Kϕ,so) and partial molar isentropic compression of transfer (ΔKϕ,so) have been calculated from speed of sound values. The pair and triplet interaction coefficient have been calculated from both the properties. The absorption spectra have also been recorded for present mixtures with the help of UV–visible spectrophotometer. A detailed insight into the physicochemical interactions e.g. ion-hydrophilic, hydrophilic–hydrophilic and hydrophilic–hydrophobic interactions in the glycine/glycylglycine-drug system along with the structure-making/structure-breaking tendency of the glycine and its dipeptide have been retrieved through the perusal of these calculated parameters.

Interaction of l-Phenylalanine with Nicotinic Acid in Buffer Solution by Volumetric Measurements at Various Temperatures

The interaction between l-phenylalanine (Phe) and nicotinic acid (NA) was studied in aqueous phosphate buffer solutions (pH 7.35) by a volumetric method. Densities of l-phenylalanine–buffer, NA–buffer and l-phenylalanine–NA–buffer mixtures were determined at T = (288.15, 298.15, 303.15, 308.15 and 313.15) K using a DSA 5000 M (Anton Paar) density meter. The apparent molar volumes of NA (\( {}^{\phi }V_{\text{NA}} \)) in buffer solution and in buffer–amino acid solutions were evaluated. The concentration of NA was varied from (0.0023 to 0.0364) mol·kg−1. The interaction of Phe with NA is accompanied by complex formation. The partial molar volumes of transfer of NA from buffer to buffer–amino acid solutions are positive. The results are discussed in terms of various interactions operating in this system.

Volumetric and Acoustic Behavior of d(+)-glucose and d(−)-fructose in Aqueous Trisodium Citrate Solutions at Different Temperatures

Apparent molar volumes (V ϕ ) and apparent molar isentropic compressions (K ϕ,S ) for saccharides d(+)-glucose and d(−)-fructose have been determined in water and (0.2, 0.4, and 0.6) mol·kg−1 aqueous solutions of trisodium citrate at T = (288.15, 298.15, 308.15 and 318.15) K and atmospheric pressure from density and speed of sound data. The partial molar volumes ( $$ V_{\phi }^{0} $$ ) and the standard partial molar volumes of transfer ( $$ \Delta V_{\phi }^{0} $$ ) from water to aqueous trisodium citrate solutions have been calculated. The partial molar expansion coefficients $$ (\partial V_{\phi }^{0} /\partial T)_{p} $$ and their second derivative $$ (\partial^{2} V_{\phi }^{0} /\partial T^{2} )_{p} $$ have also been estimated. The partial molar isentropic compression ( $$ K_{\phi ,S}^{0} $$ ) and partial molar isentropic compression of transfer ( $$ \Delta K_{\phi ,S}^{0} $$ ) have been calculated from the speed of sound data. Pair and triplet interaction parameters (V AB, V ABB) and (K AB and K ABB) from volumetric and speed of sound data, respectively, have been calculated using the McMillan–Mayer theory The results are discussed in terms of stereochemistry of the solutes and prevailing interaction in the mixtures.

Volumetric, acoustic and viscometric behaviour of dipotassium hydrogen phosphate and disodium hydrogen phosphate in aqueous solution of N-acetyl glycine at different temperatures

Densities, speeds of sound and viscosities of dipotassium hydrogen phosphate (DPHP) and disodium hydrogen phosphate (DSHP) in aqueous solutions of N-acetyl glycine (AcGly) are reported at different temperatures. Densities and speeds of sound have been used to calculate apparent molar volume, apparent molar isentropic compression, partial molar volume, partial molar isentropic compression, partial molar volume of transfer, partial molar isentropic compression of transfer and partial molar expansivity. Pair and triplet interaction coefficients have also been calculated. Experimental viscosities have been used to determine B-coefficients. Further pair and triplet interaction coefficients have also been calculated. The results are discussed in terms of solute–solvent interactions.

Transfer Properties of Diglycine from Water to Aqueous Alkali Metal Nitrate Solutions

Enthalpies of solution and densities of diglycine in aqueous solutions of LiNO3, NaNO3 and KNO3 were measured at 298.15 K. Transfer enthalpies ( $$ \Delta_{\text{tr}} H $$ ) and transfer partial molar volumes ( $$ \Delta_{\text{tr}} V_{\phi }^{0} $$ ) were derived for diglycine. The transfer enthalpies of diglycine from water to the three alkali metal nitrates solutions are negative while the transfer partial molar volume values are positive. The absolute values of $$ \Delta_{\text{tr}} H $$ and $$ \Delta_{\text{tr}} V_{\phi }^{0} $$ from water to the same concentration in salt solutions in both cases vary in the relative order LiNO3 < KNO3 < NaNO3. The results are discussed in terms of electrostatic interaction and structural interactions. Electrostatic interaction between the diglycine zwitterion and salts gives large contributions to Δtr H and $$ \Delta_{\text{tr}} V_{\phi }^{0} $$ . But, structursal interaction is responsible for the abnormal behavior of diglycine in aqueous LiNO3 solutions.

Volumetric, acoustical and viscometric behavior of glycine and DL-alanine in aqueous furosemide solutions at different temperatures

Drug (furosemide)–amino acid (glycine and DL-alanine) interactions have been investigated in aqueous medium from density (ρ), speed of sound (u) and viscosity (η) studies. The density and speed of sound data has been employed to obtain partial molar volume(Vϕo), partial molar volume of transfer(ΔtrVϕo), partial molar expansion coefficient∂Vϕo∂Tp, second derivative∂2Vϕo∂T2p, isentropic compressibility(κs), partial molar isentropic compressibility (κϕ,so) and partial molar isentropic compressibility of transfer(Δtrκϕ,so). The viscosity data have been used to calculate the viscosity B-coefficients, its temperature derivative dB/dT, viscosity B-coefficient of transfer (ΔtrB) and various thermodynamic parameters of activation of viscous flow for amino acids in furosemide solutions. A detailed insight into the physicochemical interactions e.g. ionic–hydrophilic, hydrophilic–hydrophilic and hydrophilic–hydrophobic interactions in the amino acid-drug system along with the structure-making/structure-breaking tendency of amino acids have been retrieved through the perusal of these calculated parameters.

Volumetric and conductometric studies on the interactions of dipeptides with potassium perfluoroalkanesulfonate in aqueous solution at different temperatures

Density and conductivity data for potassium perfluoroalkanesulfonate ((potassium perfluorobutanesulfonate (PFBS) and potassium perfluorooctanesulfonate (PFOS))+dipeptide+water) systems were determined at different temperatures. The standard partial molar volume (V2,ϕo), standard partial molar volume of transfer for dipeptide from water to aqueous potassium perfluoroalkanesulfonate solutions (ΔtVo), hydration number (NH), partial molar expansibility (Eϕo) and Hepler’s constant for the dipeptides have been calculated from density data. Electrical conductivity was used to estimate the limiting molar conductivity (Λo), Walden product (Λoη) and energy of activation of the transfer process (Ea) of potassium perfluoroalkanesulfonate in aqueous dipeptide solutions. Effects of temperature and the hydrocarbon chain length of the dipeptides on the volumetric and conductometric properties were examined. The results have been interpreted in terms of solute–solvent interactions and structural changes in the mixed solutions.

Volumetric and viscometric study of amino acids in aqueous sorbitol solution at different temperatures

Densities (ρ) and viscosities (η) of glycine, l-alanine, l-valine, l-threonine and l-arginine in (0.2, 0.4, 0.6, 0.8 and 1.0)mol·kg−1 aqueous sorbitol solutions have been measured at T=(293.15, 303.15, 313.15 and 323.15)K under atmospheric pressure. The apparent molar volume (Vφ) and the limiting partial molar volumes of amino acids (Vφ0) were calculated through the density data. And the limiting partial molar volumes of transfer (ΔtrVφ0) and interaction coefficients Vab, and Vabb were also determined. The extended Jones–Dole equation was used to correlate the viscosities in order to obtain viscosity B-coefficient and the free energies of activation per mole of solvent (Δμ10≠) and solute (Δμ20≠). The limiting partial molar volume of transfer and the free energies of activation per mole of both solvent (Δμ10≠) and solute (Δμ20≠) were discussed on the basis of the co-sphere overlap model and transition state theory, respectively. The hydration number of amino acids was computed using the obtained limiting partial molar volume and viscosity B-coefficient. Additionally, the group contribution method was applied to determine the respective contribution of (NH3+, COO−), CH2, OH and CNHNHNH2 to Vφ0 and B-coefficient.

Interionic Interactions of Aqueous Mixtures of Ionic Liquid 1-Hexyl-3-methylimidazolium Chloride with Phosphate Salts at T = (288.15 to 308.15) K: Volumetric, Acoustic and UV Absorption Studies

The interactions of phosphate salts like disodium hydrogen phosphate (Na2HPO4) and dipotassium hydrogen phosphate (K2HPO4) with 1-hexyl-3-methylimidazolium chloride ([C6mim][Cl]) as a function of temperature have been investigated by combination of volumetric and acoustic measurements. Densities, ρ, and speeds of sound, u, for phosphate salts in aqueous solutions of 1-hexyl-3-methylimidazolium chloride have been measured at T = (288.15, 293.15, 298.15, 303.15, 308.15) K and atmospheric pressure. The apparent molar volume, limiting apparent molar volume and standard partial molar volumes of transfer for phosphate salts from water to aqueous 1-hexyl-3-methylimidazolium chloride solutions have been calculated from density data. Apparent molar isentropic compression, limiting apparent molar isentropic compression and standard partial molar isentropic compression of transfer have been calculated from speeds of sound data. The UV absorption studies have also made in this study. The results have been explained i...

Investigation on solute–solvent interactions of glycine, l-alanine and l-valine in aqueous tetraethylammonium iodide solutions at different temperatures with reference to volumetric and acoustic measurements

The interactions of amino acids glycine, l-alanine and l-valine with tetraethylammonium iodide (TEAI) as a function of temperature have been investigated by a combination of volumetric and acoustic measurement. Densities (ρ) and ultrasonic speeds (u) of amino acids in aqueous solutions of TEAI have been measured at T=(288.15, 293.15, 298.15, 303.15 and 308.15)K and p=0.1MPa. The apparent molar volume (V∅), the partial molar volume (V∅0) and standard partial molar volumes of transfer (ΔV∅0) for amino acids from water to aqueous TEAI solutions have been calculated from density values. Apparent molar isentropic compressibility (K∅,s), partial molar isentropic compressibility (K∅,s0), partial molar isentropic compressibility of transfer (ΔK∅,s0) have been calculated from values of the ultrasonic speed. The pair and triplet interaction coefficients have been calculated from both properties. The linear variation of V∅0 with the number of carbon atoms in the alkyl chain of amino acids has been utilized to calculate the contribution of the charged end groups (NH3+,COO-), (CH2) group and other alkyl chains of the amino acids to V∅0. The results obtained are discussed in the light of various interactions operating in ternary systems of amino acids, water and TEAI.

Interaction studies of methyl acetate in aqueous solutions of quinoxaline derivatives: Effect of temperature and concentration

The aim of the present work is to examine the effect of temperature and concentration on interactions of methyl acetate with aqueous solutions of quinoxaline derivatives using volumetric and acoustic properties. In addition to this, the density, ρ, and sound velocity, u, of methyl acetate in aqueous solutions of quinoxaline derivatives namely: (N-{−3-[1-methanesulfonyl-5-(quinoxalin-6-yl)-4,5-dihydropyrazol-3-yl] phenyl} methane sulfonamide [MQDPMS]), N-{−2-[1-acetyl-5-(quinoxalin-5-yl)-4, 5-dihydropyrazol-3-yl] phenyl} methane sulfonamide [AQDPMS], N-{−2-[1-propanoyl-5-(quinoxalin-6-yl)-4,5-dihdro-1H-pyrazol-3-yl] phenyl} methane sulfonamide [2PQDPMS] and N-{−3-[1-propanoyl-5-(quinoxalin-6-yl)-4,5-dihydro-1H-pyrazol-3-yl] phenyl} methane sulfonamide [3PQDPMS] have been measured at 293.15, 298.15, 303.15 and 308.15K and at pressure p=0.1MPa. These data have been used to calculate the derived properties such as apparent molar volume, Vφ, and apparent molar adiabatic compressibility, kφ, for the mixtures. The standard partial molar volume, Vφ0, standard partial molar volume of transfer, ΔVφ0, standard partial molar adiabatic compressibility, kφ0, and standard partial molar adiabatic compressibility of transfer, Δkφ0, have been evaluated using Redlich–Mayer type equation. These results have been interpreted in terms of effect of temperature and concentration on interactions such as solute–solute, solute–solvent and solvent–solvent which exist in the mixtures. Furthermore, apparent molar expansivity, Eφ0, and Hepler's constant values, ∂2Vφ0/∂T2, have been evaluated to support the conclusions obtained from the volumetric and acoustic studies.

Solute–solvent interactions of glycine, l-alanine, and l-valine in aqueous 1-methyl imidazolium chloride ionic liquid solutions in the temperature interval (288.15 to 308.15) K

In the present study, volumetric and acoustic methods have been used to interpret intermolecular interactions of amino acids (glycine, l-alanine, and l-valine) in aqueous solutions of an ionic liquid, 1-methyl imidazolium chloride [mim][Cl] as a function of temperature. The density, ρ and speed of sound, c of glycine, l-alanine and l-valine in aqueous 1-methyl imidazolium chloride solutions have been measured in the temperature interval T=(288.15 to 308.15)K and atmospheric pressure. Then apparent molar volume (Vϕ) and apparent molar adiabatic compressibility (Kϕ,s) of these mixtures at the investigated temperatures have been calculated. The standard partial molar volumes (Vϕ0), standard partial molar volumes of transfer (ΔVϕ0), standard partial molar adiabatic compressibility (Kϕ,s0), and standard partial molar adiabatic compressibility (ΔKϕ,s0) of transfer have also been determined for these amino acid solutions. The results have been discussed in terms of interactions existing among solute and solvent. Also, the temperature dependence of the apparent molar volume has been used to calculate apparent molar expansivity ϕE0 and Hepler’s constant ∂2Vϕ0/∂T2, to verify the conclusions obtained from volumetric and speed of sound properties.

Transfer Properties of Glycylglycine from Water to Aqueous NaNO3, NaClO4, and Na2SO4 Solutions

Enthalpies of solution and densities of glycylglycine in aqueous solutions of NaNO3, NaClO4, and Na2SO4 were measured at 298.15 K. Standard transfer enthalpies (ΔtrH0), standard transfer partial molar volume (ΔtrVϕ0), and hydration numbers (Nh) have been determined for glycylglycine. All of the ΔtrH0 values are negative in the three salt solutions. The relative order of ΔtrH0 in the same concentration of 1–1 type salts is NaNO3 > NaClO4. The ΔtrH0 in low concentration of Na2SO4 solutions is between the corresponding values in NaNO3 and NaClO4 solutions. With increasing Na2SO4 concentration, the ΔtrH0 values exceed that in NaNO3 solutions. The ΔtrVϕ0 values are positive and vary in the sequence Na2SO4 > NaNO3 > NaClO4. The results were discussed in terms of various interactions.

Partial molar volumes and viscous properties of glycine-aqueous urea solutions at 298.15 K

Density (ρ) and viscosity (η) of glycine (c = 0.02–0.22 mol dm−3) in aqueous urea (c = 0.5, 1.5, and 3.0 mol dm−3) solutions were measured at 298.15 K. Experimental density data has been used to calculate apparent molar volumes (φv) of glycine in aqueous and aqueous-urea solutions at 298.15 K. The dependence of apparent molar volumes on concentration of glycine was fitted to the Massons relation and apparent molar volume of glycine at infinite dilution (partial molar volume, φv0) was determined graphically. The partial molar volumes of transfer (Δtrφv0) of glycine at infinite dilution from pure water to aqueous-urea solutions at 298.15 K were calculated and interpreted in terms of various interactions and structural fittings in studied solutions. The relative viscosity data has been analyzed by Jones-Dole relation and viscosity B-coefficients were determined graphically. Viscosity B-coefficient of transfer (ΔB) was also calculated and compared with Δtrφv0.

Concentration dependences of density, viscosity, refractive index, and other derived properties of metoclopramide aqueous solutions at 303.15 K

Density (ρ), viscosity (η) and refractive index (nD) of an antiemetic drug metoclopramide (4-amino-5-chloro-N-(2-(diethylamino)ethyl)-2-methoxybenzamide hydrochloride) solutions containing amino acids (glycine, D-alanine, L-cystine and L-histidine) were measured in the concentration range 0.01–0.17 mol/dm3 at 303.15 K. The apparent molar volume (φv) of this drug in aqueous amino acid solutions was calculated from the density data and fitted to the Massons relation, and the partial molar volume φv0 of the drug was determined graphically. The partial molar volumes of transfer (Δtrφv0) of drug at infinite dilution from pure water to aqueous amino acid solutions were calculated and interpreted in terms of different interactions between the drug and amino acids.