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Journal of Solution Chemistry

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https://www.readbyqxmd.com/read/28936012/effect-of-base-acid-properties-of-mixtures-of-ethanol-with-water-on-the-enthalpy-of-solution-of-cyclic-ethers-in-these-mixtures-at-t%C3%A2-%C3%A2-298-15%C3%A2-k
#1
Małgorzata Jóźwiak
The enthalpies of solution of the cyclic ethers 1,4-dioxane, 12-crown-4 and 18-crown-6 in mixtures of ethanol and water have been measured within the whole mole fraction range at T = 298.15 K. The enthalpy of solvation has been calculated. In pure ethanol and pure water, the solvation enthalpy of the investigated cyclic ethers depends linearity on the number of -CH2CH2- groups in the cyclic ether molecules. Based on the analysis of the preferential solvation model proposed by Waghorne, it can be concluded that the 1,4-dioxane, 15C5 and 18C6 molecules are preferentially solvated by water molecules in the range of low water content in these mixtures...
2017: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/28931958/descriptors-for-pentane-2-4-dione-and-its-derivatives
#2
Michael H Abraham, William E Acree
We have used equations for partition coefficients of compounds from water and the gas phase to various solvents to obtain descriptors for pentane-2,4-dione and 21 of its derivatives. These descriptors can then be used to estimate further partition coefficients into a wide variety of solvents. The descriptors also yield information about the properties of pentane-2,4-dione and its derivatives. Pentane-2,4-dione and its alkyl derivatives are quite polar, with substantial hydrogen bond basicity but with no hydrogen bond acidity...
2017: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/28798501/dimerization-constants-from-acoustic-measurements-solutions-of-benzene-cyclohexylamine-and-aniline-in-cyclohexane
#3
Andrzej Burakowski, Jacek Gliński
A model assuming that the formation of dimers determines the acoustic properties of liquid mixtures, in the inert solvent cyclohexane, was applied to describe the observed dependences of sound speed on composition. The dimerization constants were estimated. The results allow one to propose that the solutes tend to form associates larger than dimers in concentrated solutions, while in dilute systems solute-solvent interactions play an important role.
2017: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/28680187/composition-of-surface-layer-at-the-water-air-interface-and-micelles-of-triton-x-100%C3%A2-%C3%A2-rhamnolipid-mixtures
#4
Diana Mańko, Anna Zdziennicka, Bronisław Jańczuk
Measurements of the surface tensions, densities and viscosities of aqueous solutions of Triton X-100 (TX-100) and rhamnolipid (RL) mixtures, at constant concentration of RL or TX-100, were carried out. The measured values of the surface tension were compared to those determined using different theoretical models and on the basis of the surface tension of aqueous solutions of individual surfactants. From the surface tension isotherms, the Gibbs surface excess concentration of TX-100 and RL, the composition of surface layer and the standard Gibbs free energy of adsorption at the water-air interface were determined...
2017: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/28280280/structure-of-a-hydrated-sulfonatotitanyl-iv-complex-in-aqueous-solution-and-the-dimethylsulfoxide-solvated-titanyl-iv-ion-in-solution-and-solid-state
#5
Daniel Lundberg, Ingmar Persson
The coordination chemistry of oxotitanium(IV) or titanyl(IV), TiO(2+), has been studied in solution by X-ray methods. The titanyl(IV) ion hydrolyzes easily in aqueous systems to solid titanium dioxide as long as it is not stabilized through complexation. In this study the structures of the hydrated bissulfatotitanyl(IV) complex and the dimethylsulfoxide (DMSO) solvated titanyl(IV) ions have been determined. In isolated monomeric titanyl complexes titanium(IV) binds strongly to a doubly bound oxo group at ca...
2017: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/28163342/analysis-of-mesoscopic-structured-2-propanol-water-mixtures-using-pressure-perturbation-calorimetry-and-molecular-dynamic-simulation
#6
Jordan W Bye, Colin L Freeman, John D Howard, Gregor Herz, James McGregor, Robert J Falconer
In this paper we demonstrate the application of pressure perturbation calorimetry (PPC) to the characterization of 2-propanol/water mixtures. PPC of different 2-propanol/water mixtures provides two useful measurements: (i) the change in heat (ΔQ); and (ii) the [Formula: see text] value. The results demonstrate that the ΔQ values of the mixtures deviate from that expected for a random mixture, with a maximum at ~20-25 mol% 2-propanol. This coincides with the concentration at which molecular dynamics (MD) simulations show a maximum deviation from random distribution, and also the point at which alcohol-alcohol hydrogen bonds become dominant over alcohol-water hydrogen bonds...
2017: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/28163341/complexation-of-nickel-ions-by-boric-acid-or-poly-borates
#7
REVIEW
Anais Graff, Etienne Barrez, Philippe Baranek, Martin Bachet, Pascale Bénézeth
An experiment based on electrochemical reactions and pH monitoring was performed in which nickel ions were gradually formed by oxidation of a nickel metal electrode in a solution of boric acid. Based on the experimental results and aqueous speciation modeling, the evolution of pH showed the existence of significant nickel-boron complexation. A triborate nickel complex was postulated at high boric acid concentrations when polyborates are present, and the equilibrium constants were determined at 25, 50 and 70 °C...
2017: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/27594720/a-simple-densimetric-method-to-determine-saturation-temperature-of-aqueous-potassium-chloride-solution
#8
Wojciech Bogacz, Mohsen H Al-Rashed, Marcin Lemanowicz, Janusz Wójcik
The precise control of crystallization is a key issue in providing a high quality crystalline product. It has to be achieved by, among other means, a proper choice of the solution processing temperature, which is determined on the basis of the metastable zone width and type of solubility curve. In this article experimental data for potassium chloride solution density, as a function of temperature and its correlation in the range from under- to supersaturation, are reported for solution concentrations between 24...
2016: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/26664009/molecular-dynamics-evaluation-of-dielectric-constant-mixing-rules-for-h2o-co2-at-geologic-conditions
#9
Raymond D Mountain, Allan H Harvey
Modeling of mineral reaction equilibria and aqueous-phase speciation of C-O-H fluids requires the dielectric constant of the fluid mixture, which is not known from experiment and is typically estimated by some rule for mixing pure-component values. In order to evaluate different proposed mixing rules, we use molecular dynamics simulation to calculate the dielectric constant of a model H2O-CO2 mixture at temperatures of 700 K and 1000 K at pressures up to 3 GPa. We find that theoretically based mixing rules that depend on combining the molar polarizations of the pure fluids systematically overestimate the dielectric constant of the mixture, as would be expected for mixtures of nonpolar and strongly polar components...
October 2015: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/26435554/thermophysical-properties-of-two-ammonium-based-protic-ionic-liquids
#10
Arijit Bhattacharjee, João A P Coutinho, Mara G Freire, Pedro J Carvalho
Experimental data for density, viscosity, refractive index and surface tension are reported, for the first time, in the temperature range between 288.15 K and 353.15 K and at atmospheric pressure for two protic ionic liquids, namely 2-(dimethylamino)-N,N-dimethylethan-1-ammonium acetate, [N11{2(N11)}H][CH3CO2], and N-ethyl-N,N-dimethylammonium phenylacetate, [N112H][C7H7CO2]. The effect of the anion aromaticity and the cation's aliphatic tails on the studied properties is discussed. From the measured properties temperature dependency the derived properties, such as the isobaric thermal expansion coefficient, the surface entropy and enthalpy, and the critical temperature, were estimated...
April 1, 2015: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/26659810/application-of-phosphonium-ionic-liquids-as-ion-carriers-in-polymer-inclusion-membranes-pims-for-separation-of-cadmium-ii-and-copper-ii-from-aqueous-solutions
#11
Beata Pospiech
Facilitated transport through polymer inclusion membranes (PIMs) is a promising method for simultaneous separation and removal of valuable and toxic metal ions from aqueous solutions. Recently, ionic liquids (ILs) have been used as extracting agents for metal ions due to their unique physicochemical properties. This paper presents research on the facilitated transport of cadmium(II) and copper(II) ions from aqueous chloride solutions through PIMs with phosphonium ILs as new selective ion carriers. Cellulose triacetate membranes containing o-nitrophenyl octyl ether (ONPOE) as a plasticizer and Cyphos IL 101 [trihexyl(tetradecyl)phosphonium chloride] or Cyphos IL 104 [trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate] as the ion carriers have been prepared and applied for investigations...
2015: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/26347039/solubility-of-carbon-dioxide-in-secondary-butyl-alcohol-at-high-pressures-experimental-and-modeling-with-cpa
#12
Sona Raeissi, Reza Haghbakhsh, Louw J Florusse, Cor J Peters
Mixtures of carbon dioxide and secondary butyl alcohol at high pressures are interesting for a range of industrial applications. Therefore, it is important to have trustworthy experimental data on the high-pressure phase behavior of this mixture over a wide range of temperatures. In addition, an accurate thermodynamic model is necessary for the optimal design and operation of processes. In this study, bubble points of binary mixtures of CO2 + secondary butyl alcohol were measured using a synthetic method. Measurements covered a CO2 molar concentration range of (0...
2015: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/26166913/dynamic-buffer-capacity-in-acid-base-systems
#13
Anna M Michałowska-Kaczmarczyk, Tadeusz Michałowski
The generalized concept of 'dynamic' buffer capacity β V is related to electrolytic systems of different complexity where acid-base equilibria are involved. The resulting formulas are presented in a uniform and consistent form. The detailed calculations are related to two Britton-Robinson buffers, taken as examples.
2015: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/25983354/ternary-liquid-liquid-equilibria-for-mixtures-of-ionic-liquid%C3%A2-%C3%A2-thiophene-or-benzothiophene%C3%A2-%C3%A2-heptane-at-t%C3%A2-%C3%A2-308-15%C3%A2-k
#14
Urszula Domańska, Klaudia Walczak
In this work, the desulfurization ability of alkyl-piperidinium-based and phosphonium-based ionic liquids (ILs) for (thiophene or benzothiophene + heptane) mixtures are studied. With this aim, ternary liquid-liquid phase equilibrium data (LLE) have been obtained for mixtures of {IL (1) + thiophene, or benzothiophene (2) + heptane (3)} at T = 308.15 K and p = 101.33 kPa. For this study 1-pentyl-1-methylpiperidinium bis{(trifluoromethyl)sulfonyl}imide, [C1C5PIP][NTf2], and tributylethylphosphonium diethylphosphate, [P2,4,4,4][DEP], were used...
2015: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/25960583/so2-solvation-in-the-1-ethyl-3-methylimidazolium-thiocyanate-ionic-liquid-by-incorporation-into-the-extended-cation-anion-network
#15
Dzmitry S Firaha, Mikhail Kavalchuk, Barbara Kirchner
We have carried out an ab initio molecular dynamics study on the sulfur dioxide (SO2) solvation in 1-ethyl-3-methylimidazolium thiocyanate for which we have observed that both cations and anions play an essential role in the solvation of SO2. Whereas, the anions tend to form a thiocyanate- and much less often an isothiocyanate-SO2 adduct, the cations create a "cage" around SO2 with those groups of atoms that donate weak interactions like the alkyl hydrogen atoms as well as the heavy atoms of the [Formula: see text]-system...
2015: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/25960582/activity-coefficients-at-infinite-dilution-and-physicochemical-properties-for-organic-solutes-and-water-in-the-ionic-liquid-1-ethyl-3-methylimidazolium-trifluorotris-perfluoroethyl-phosphate
#16
Michał Wlazło, Andrzej Marciniak, Trevor M Letcher
New data of activity coefficients at infinite dilution, γ 13 (∞), for 65 different solutes including alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, aldehydes, esters and water in the ionic liquid 1-ethyl-3-methylimidazolium trifluorotris(perfluoroethyl)phosphate, were determined using inverse gas chromatography within the temperature range from 318.15 to 368.15 K. This is a continuation of our study of ionic liquids based on this anion. The results are compared with the other trifluorotris(perfluoroethyl)phosphate ionic liquids...
2015: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/25484474/stability-and-solution-structure-of-binary-and-ternary-cu-ii-complexes-with-l-glutamic-acid-and-diamines-as-well-as-adducts-in-metal-free-systems-in-aqueous-solution
#17
Romualda Bregier-Jarzebowska
Binary and ternary complexes of copper(II) with l-glutamic acid (Glu) and diamines 1,3-diaminopropane and 1,4-diaminobutane, putrescine (tn, Put), as well as adducts formed in the metal-free systems, have been investigated in aqueous solutions. The types of complexes formed and their overall stability constants were established on the basis of computer analysis of potentiometric results. The reaction centers and the modes of interaction were identified on the basis of spectroscopic studies (NMR, Vis and EPR)...
2014: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/25484473/density-viscosity-and-surface-tension-of-binary-mixtures-of-1-butyl-1-methylpyrrolidinium-tricyanomethanide-with-benzothiophene
#18
Urszula Domańska, Marta Królikowska, Klaudia Walczak
The effects of temperature and composition on the density and viscosity of pure benzothiophene and ionic liquid (IL), and those of the binary mixtures containing the IL 1-butyl-1-methylpyrrolidynium tricyanomethanide ([BMPYR][TCM] + benzothiophene), are reported at six temperatures (308.15, 318.15, 328.15, 338.15, 348.15 and 358.15) K and ambient pressure. The temperature dependences of the density and viscosity were represented by an empirical second-order polynomial and by the Vogel-Fucher-Tammann equation, respectively...
2014: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/25190896/phase-equilibria-of-ternary-and-quaternary-systems-containing-diethyl-carbonate-with-water
#19
Yao Chen, Caiyu Wen, Xiaoming Zhou, Jun Zeng
In this study liquid phase equilibrium compositions were measured at 298.15 K under atmospheric pressure for (water + propan-1-ol + diethyl carbonate (DEC) + benzene or cyclohexane or heptane) quaternary systems and (water + DEC + propan-1-ol or benzene or cyclohexane) ternary systems. Good correlation of the experimental LLE data was seen for the measured systems by both modified and extended UNIQUAC models. The solubility of DEC in aqueous and organic phases is shown by equilibrium distribution coefficients calculated from the LLE data...
2014: Journal of Solution Chemistry
https://www.readbyqxmd.com/read/25067861/tautomeric-and-microscopic-protonation-equilibria-of-anthranilic-acid-and-its-derivatives
#20
Lidia Zapała, Elżbieta Woźnicka, Jan Kalembkiewicz
The acid-base chemistry of three zwitterionic compounds, namely anthranilic (2-aminobenzoic acid), N-methylanthranilic and N-phenylanthranilic acid has been characterized in terms of the macroconstants K a1, K a2, the isoelectric point pH I, the tautomerization constant K z and microconstants k 11, k 12, k 21, k 22. The potentiometric titration method was used to determine the macrodissociation constants. Due to the very poor water solubility of N-phenylanthranilic acid the dissociation constants pK a1 and pK a2 were determined in MDM-water mixtures [MDM is a co-solvent mixture, consisting of equal volumes of methanol (MeOH), dioxane and acetonitrile (MeCN)]...
2014: Journal of Solution Chemistry
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