Ionic equilibria of picric acid in mixed amphiprotic solvents.  The 2-methoxyethanol/water solvent system

Marchetti, Andrea; Picchioni, Emanuele.; Tassi, Lorenzo; Tosi, Giuseppe

doi:10.1021/ac00192a039

Cited by 12 publications

(9 citation statements)

References 15 publications

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“…The need to have an available K = K(T, function has been resolved, as already done in some previous papers (10)(11)(12), by suggesting an empirical approach which leads to:…”

Section: Resultsmentioning

confidence: 99%

“…A comparison among the various K = K(T, X) equations proposed in the present work and in previous studies (10)(11)(12) for similar solvent systems has been made by considering the criteria of the smallest difference between calculated and experimental values, of the simplest equation, and of the applicability to the largest number of solvent systems. This comparison has suggested that, in general, quite acceptable agreement between calculated and experimental values is achieved, even if the same equation may be employed with better results for the present system and for the previously studied GlietIGliem one.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

Marchetti¹,

Preti²,

Tagliazucchi³

et al. 1991

Can. J. Chem.

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Three empirical equations are proposed to fit the experimental values of the dissociation constant for picric acid, chosen as guide-solute working in the N, N-dimethylformamide/2-methoxyethanol solvent system. The work was performed operating at 19 temperatures ranging from − 10 to + 80 °C in the pure solvents and in their nine mixtures, identified by the mole fraction (X) of one component. This empirical treatment, which describes the dependence of the dissociation constant on temperature and composition of the solvent mixture, is represented by functions of the type K = K(T), K = K(X), and K = K(T, X). The K = K(T, X) equation in its complete form is composed of 20 terms, some of which can be eliminated because of small statistical weight; the number and type of these terms vary on passing from one solvent system to another and the best-fitting form is suggested. A comparison among various K = K(T, X) equations proposed in the present and in previous works has been made. Key words: dissociation equilibria, binary nonaqueous solvent mixtures, picric acid, N,N-dimethylformamide, 2-methoxyethanol.

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“…The need to have an available K = K(T, function has been resolved, as already done in some previous papers (10)(11)(12), by suggesting an empirical approach which leads to:…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

Marchetti¹,

Preti²,

Tagliazucchi³

et al. 1991

Can. J. Chem.

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“…It has unique solvating properties associated with its "quasiaprotic" character and is widely used for electrochemical investigations and various industrial processes. [5][6][7] Even though ME has drawn much attention in recent years as a solvent for electroanalytical investigations, 8,9 very few reliable studies on the electrolytic behavior in this nonaqueous medium have so far been made. Therefore, as a part of a series of investigations on the chemical nature of structure of ions on their mutual and specific interactions with solvent molecules, [10][11][12][13][14][15][16][17][18] we have performed conductivity and ultrasonic velocity measurements on 2-methoxyethanol solutions of potassium picrate (KPic), potassium tetraphenylborate (KBPh 4 ), tetrabutylammonium tetraphenylborate (Bu 4 NBPh 4 ), and tetraphenylarsonium picrate (Ph 4 AsPic) as functions of temperature (288.15 e T/K e 308.15).…”

Section: -Methoxyethanol (Mementioning

confidence: 99%

Thermodynamics of Ion Association and Solvation in 2-Methoxyethanol: Behavior of Tetraphenylarsonium, Picrate, and Tetraphenylborate Ions from Conductivity and Ultrasonic Data

et al. 1999

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Precise measurements on electrical conductances and ultrasonic velocities of solutions of potassium picrate (KPic), potassium tetraphenylborate (KBPh 4 ), tetrabutylammonium tetraphenylborate (Bu 4 NBPh 4 ), and tetraphenylarsonium picrate (Ph 4 AsPic) in 2-methoxyethanol (ME) at temperatures 288.15 e T/K e 308.15 have been reported. The conductance data have been analyzed by the 1978 Fuoss conductance-concentration equation. Thermodynamics of the association processes have also been studied and the Coulombic forces are found to play a major role in the association processes. The limiting ionic conductances have been estimated from the appropriate division of the limiting molar conductivity values of the "reference electrolyte" Bu 4 -NBPh 4 . Strong association was found for all these salts in this solvent medium. The results strongly suggest the electrostriction of the solvent molecules around the potassium and picrate ions, while for the larger tetrabutylammonium and tetraphenylarsonium ions they are accommodated inside the space between the alkyl or aryl chains attached to the nitrogen or arsenic atom; for tetraphenylborate ion, however, neither electrostriction nor penetration of the solvent molecules is found to be important.

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“…The pure solvents and their binaries, obtained by mixing each component with each other, have been utilized in the past as potentially useful media for electrochemical investigations on ionization and dissociation reactions in solution (6)(7)(8)(9). In an extension of our research about the electrolytic behavior into the ternary solvent mixtures, we are recording the experimental measurements on the thermomechanical properties of the above-mentioned ternaries.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of ethane-1,2-diol + 2-methoxyethanol + water liquid ternary mixtures

Corradini¹,

Malagoli²,

Marcheselli³

et al. 1993

J. Chem. Eng. Data

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The dielectric properties of ethane-1,2-diol (1) + 2-methoxyethanol (2) + water (3) were measured in the range 30 5 t/°C < 50 and for 66 ternary mixtures covering the whole miscibility field (0 < xi/x2/x3 < 1). The e values were analyzed by some empirical equations based on the pure-component properties for the ternaries studied. A comparison of the experimental and calculated data shows that the selected equations can be safely employed to predict the dependence of < on the temperature and on the composition of the systems studied when binary and/or ternary experimental data are not available.

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Ionic equilibria of picric acid in mixed amphiprotic solvents. The 2-methoxyethanol/water solvent system

Cited by 12 publications

References 15 publications

Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

Dissociation equilibria of picric acid in the binary N, N-dimethylformamide/2-methoxyethanol solvent system

Thermodynamics of Ion Association and Solvation in 2-Methoxyethanol: Behavior of Tetraphenylarsonium, Picrate, and Tetraphenylborate Ions from Conductivity and Ultrasonic Data

Dielectric properties of ethane-1,2-diol + 2-methoxyethanol + water liquid ternary mixtures

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