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Journal of Solution Chemistry | Page 2

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https://read.qxmd.com/read/26166913/dynamic-buffer-capacity-in-acid-base-systems
#21
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://read.qxmd.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
#22
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://read.qxmd.com/read/25960583/so2-solvation-in-the-1-ethyl-3-methylimidazolium-thiocyanate-ionic-liquid-by-incorporation-into-the-extended-cation-anion-network
#23
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://read.qxmd.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
#24
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://read.qxmd.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
#25
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://read.qxmd.com/read/25484473/density-viscosity-and-surface-tension-of-binary-mixtures-of-1-butyl-1-methylpyrrolidinium-tricyanomethanide-with-benzothiophene
#26
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://read.qxmd.com/read/25190896/phase-equilibria-of-ternary-and-quaternary-systems-containing-diethyl-carbonate-with-water
#27
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://read.qxmd.com/read/25067861/tautomeric-and-microscopic-protonation-equilibria-of-anthranilic-acid-and-its-derivatives
#28
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
https://read.qxmd.com/read/24899753/densities-excess-molar-volumes-and-thermal-expansion-coefficients-of-aqueous-aminoethylethanolamine-solutions-at-temperatures-from-283-15-to-343-15%C3%A2-k
#29
Marcin Stec, Adam Tatarczuk, Dariusz Spiewak, Andrzej Wilk
The densities of aqueous mixtures of aminoethylethanolamine (CAS #000111-41-1) were measured over the entire compositional range at temperatures of 283.15-343.15 K. The results of these measurements were used to calculate excess molar volumes and isobaric thermal expansion coefficients, and partial molar and apparent molar volumes and excess isobaric thermal expansion coefficients were subsequently derived. The excess molar volumes were correlated as a function of the mole fraction using the Redlich-Kister equation...
2014: Journal of Solution Chemistry
https://read.qxmd.com/read/24563561/partial-molar-volumes-of-15-crown-5-ether-in-mixtures-of-n-n-dimethylformamide-with-water
#30
Magdalena Tyczyńska, Małgorzata Jóźwiak
The density of 15-crown-5 ether (15C5) solutions in the mixtures of N,N-dimethylformamide (DMF) and water (H2O) was measured within the temperature range 293.15-308.15 K using an Anton Paar oscillatory U-tube densimeter. The results were used to calculate the apparent molar volumes (V Φ ) of 15C5 in the mixtures of DMF + H2O over the whole concentration range. Using the apparent molar volumes and Redlich and Mayer equation, the standard partial molar volumes of 15-crown-5 were calculated at infinite dilution ([Formula: see text])...
2014: Journal of Solution Chemistry
https://read.qxmd.com/read/23761944/intrinsic-31-p-nmr-chemical-shifts-and-the-basicities-of-phosphate-groups-in-a-short-chain-imino-polyphosphate
#31
Hideshi Maki, Masahiko Tsujito, Tetsuji Yamada
ABSTRACT: The stepwise protonation constants of two linear triphosphate ligand anions, triphosphate, [Formula: see text] and di-imidotriphosphate, [Formula: see text], were investigated by potentiometric titration, and the intrinsic chemical shifts of the stepwise protonated species of these anions were determined from the pH-dependence of the (31)P NMR chemical shifts. All stepwise protonation constants of [Formula: see text]were found to be larger than those of [Formula: see text], and the (31)P NMR signals due to P3O8(NH)2 always appeared at a lower magnetic field compared to the signals due to P3O10...
June 2013: Journal of Solution Chemistry
https://read.qxmd.com/read/23761943/volumetric-properties-of-the-x-1-c4mim-meso4-%C3%A2-%C3%A2-1%C3%A2-%C3%A2-x-1-meoh-system-at-temperatures-from-283-15-to-333-15-k-and-pressures-from-0-1-to-35-mpa
#32
Dobrochna Matkowska, Tadeusz Hofman
Densities of pure 1-butyl-3-methylimidazolium methylsulfate, [C4mim][MeSO4], and its mixtures with methanol have been measured. Measurements were made with an accuracy of ±0.2 kg·m(-3), using a vibrating-tube densimeter, over the temperature and pressure ranges (283.15-333.15) K and (0.1-35) MPa, respectively. The experimental densities for the pure ionic liquid and alcohol have been correlated by the Tait equation. The results for the {x 1[C4mim][MeSO4] + (1 - x 1)MeOH} system have been correlated by a van Laar equation involving parameters that are dependent on temperature and pressure...
June 2013: Journal of Solution Chemistry
https://read.qxmd.com/read/23761942/ultrasonic-studies-on-molecular-interactions-in-binary-mixtures-of-n-methyl-aniline-with-methyl-isobutylketone-3-pentanone-and-cycloalkanones-at-303-15%C3%A2-k
#33
M Gowrisankar, P Venkateswarlu, K Sivakumar, S Sivarambabu
Densities, ρ, viscosities, η, and ultrasonic sound velocities u of pure methyl isobutylketone, diethylketone, cyclopentanone, cyclohexanone, 2-methyl cyclohexanone and those of their binary mixtures with N-methyl aniline were measured at 303.15 K over the entire composition range. These experimental data have been used to calculate the excess volume (V (E)), deviation in ultrasonic sound velocity (∆u), isentropic compressibility (κ s ), intermolecular free length (L f), excess intermolecular free length ([Formula: see text]), acoustic impedance (Z), excess isentropic compressibility ([Formula: see text]), deviation in viscosity (∆η) and excess Gibbs energy of activation of viscous flow (G (*E))...
June 2013: Journal of Solution Chemistry
https://read.qxmd.com/read/23661859/comparison-of-aqueous-and-1-octanol-solubility-as-well-as-liquid-liquid-distribution-of-acyclovir-derivatives-and-their-complexes-with-hydroxypropyl-%C3%AE-cyclodextrin
#34
Małgorzata Koźbiał, Paweł Gierycz
The aim of the presented work is the comparison of aqueous and 1-octanol solubilities of different acyclovir derivatives and their hydroxypropyl-β-cyclodextrin inclusion complexes. The solubility measurements were carried out at different temperatures over the range 25-45 °C using water, 1-octanol, water saturated with 1-octanol, 1-octanol saturated with water, buffered aqueous solutions (pH = 5.5 and 7.0) and buffered aqueous solutions containing cyclodextrin as solvents. The aqueous solubilities of the compounds are very low but may be enhanced by complexation with hydroxypropyl-β-cyclodextrin, especially if the acyclovir derivatives have aromatic groups which may be included in the cyclodextrin cavity...
May 2013: Journal of Solution Chemistry
https://read.qxmd.com/read/23543864/mass-and-ion-transport-in-ketones-and-ketone-electrolytes-comparison-with-acetate-systems
#35
Dharshani N Bopege, Matt Petrowsky, Matthew B Johnson, Roger Frech
Self-diffusion coefficient measurements were performed for pure n-alkyl ketone liquids using the pulsed field gradient NMR spin-echo technique. Ionic conductivities and dielectric constants of 0.0055 mol·L(-1) tetrabutylammonium trifluoromethanesulfonate in 2-pentanone, 2-hexanone, 2-heptanone, 2-octanone, 2-nonanone, and 2-decanone were also measured. The temperature-dependent conductivities and diffusion coefficients over the range 5-80 °C can be described using the compensated Arrhenius formalism. Compensated Arrhenius equation plots were used to calculate the average activation energy for both sets of data...
March 2013: Journal of Solution Chemistry
https://read.qxmd.com/read/23483033/electrochemical-behavior-of-cobaltocene-in-ionic-liquids
#36
Andrzej Lewandowski, Lukasz Waligora, Maciej Galinski
The electrochemical behavior of cobaltocenium has been studied in a number of room temperature aprotic ionic liquids. Well defined, diffusion controlled, anodic and cathodic peaks were found for the Cc(+)/Cc (cobaltocenium/cobaltocene) reduction/oxidation on gold, platinum and glassy carbon electrodes. Values of the peak separation parameters suggest quasireversibility or even irreversibility for the redox process. The difference between the ferrocene/ferrocenium and cobaltocenium/cobaltocene couples has been evaluated as equal to (1...
February 2013: Journal of Solution Chemistry
https://read.qxmd.com/read/24319302/solubility-of-omeprazole-sulfide-in-different-solvents-at-the-range-of-280-35-319-65%C3%A2-k
#37
Yihua Li, Wenge Yang, Tuan Zhang, Chaoyuan Wang, Kai Wang, Yonghong Hu
Solubility data were measured for omeprazole sulfide in ethanol, 95 mass-% ethanol, ethyl acetate, isopropanol, methanol, acetone, n-butanol and n-propanol in the temperature range from 280.35 to 319.65 K by employing the gravimetric method. The solubilities increase with temperature and they are in good agreement with the calculated solubility of the modified Apelblat equation and the λh equation. The experimental solubility and correlation equation in this work can be used as essential data and model in the purification process of omeprazole sulfide...
2013: Journal of Solution Chemistry
https://read.qxmd.com/read/24319301/modelling-of-the-critical-micelle-concentration-of-cationic-gemini-surfactants-using-molecular-connectivity-indices
#38
Anna Mozrzymas
Modelling of the critical micelle concentrations (cmc) using the molecular connectivity indices was performed for a set of 21 cationic gemini surfactants with medium-length spacers. The obtained model contains only the second-order Kier and Hall molecular connectivity index. It is suggested that the index (2) χ includes some information about flexibility. The obtained model was used to predict log10 cmc of other cationic gemini surfactants. The agreement between calculated and experimental values of log10 cmc for the gemini surfactants that were not used in the correlation is very good...
2013: Journal of Solution Chemistry
https://read.qxmd.com/read/24319300/stabilities-of-the-divalent-metal-ion-complexes-of-a-short-chain-polyphosphate-anion-and-its-imino-derivative
#39
Hideshi Maki, Masahiko Tsujito, Makoto Sakurai, Tetsuji Yamada, Hiroyuki Nariai, Minoru Mizuhata
ABSTRACT: The stability constants of ML-type complexes of the two linear triphosphate ligand anion analogues triphosphate ([Formula: see text]) and diimidotriphosphate ([Formula: see text]) were investigated thermodynamically using potentiometric titrations according to Schwarzenbach's procedure. The stability constants of the ML-type complexes of different divalent metal ions with [Formula: see text] are larger than those of the corresponding complexes with [Formula: see text] because of the greater basicity of the imino group...
2013: Journal of Solution Chemistry
https://read.qxmd.com/read/24273357/equilibrium-studies-of-dibutyltin-iv-zwitterionic-buffer-complexation
#40
M A El-Gahami, H M Albishri
Equilibrium studies in aqueous solution are reported for dibutyltin(IV) (DBT) complexes of the zwitterionic buffers "Good's buffers" Mes and Mops. Stoichiometric and formation constants of the complexes formed were determined at different temperatures and ionic strength 0.1 mol·L(-1) NaNO3. The results show that the best fit of the titration curves were obtained when the complexes ML, MLH-1, MLH-2 and MLH-3 were considered beside the hydrolysis product of the dibutyltin(IV) cation. The thermodynamic parameters ΔH (o), ΔS (o) and ΔG (o) calculated from the temperature dependence of the formation constant of the dibutyltin(IV) complexes with 2-(N-morpholino)ethanesulfonic acid (Mes) and 3-(N-mor-pholino)-propanesulfonic acid (Mops) were investigated...
2013: Journal of Solution Chemistry
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