We measured the solubility of some potassium salts (KF, KCl, KBr, KI, KNO3, KClO4, KSCN, and KSeCN) in anhydrous ethylene carbonate (EC, see the figure) at different temperatures (between 20° and 60° C). EC is a polar organic solvent that possesses a significant permanent dipole moment (µ = 4.9 D) and a large relative dielectric constant (εr = 90).1 From the solubility data the main thermodynamic functions were calculated, and discussed in terms of solvation, solvent structuredness, and ion pair formation.2 The data indicate a significant specific anion effect that follows the direct Hofmeister series.3 Specific chemical interactions of EC molecules with thiocyanate and selenocyanate are reported. [1] Y. Chernyak, J. Chem. Eng. Data 2010, 51, 416-418. [2] Y. Marcus, J. Sol. Chem. 1992, 21, 1217-1230. [3] B.W. Ninham, P. Lo Nostro, Molecular Forces and Self Assembly. In Colloid, Nano Sciences and Biology. Cambridge University Press (Cambridge), 2010.
Hofmeister effects in water-free systems: the solubility of salts in ethylene carbonate / Niccolò Peruzzi; Virginia Mazzini; Barry Ninham; Piero Baglioni; Pierandrea Lo Nostro. - STAMPA. - (2011), pp. ---. (Intervento presentato al convegno 25th Meeting of the European Colloid and Interface Science Society tenutosi a Berlino nel 4-9 settembre 2011).
Hofmeister effects in water-free systems: the solubility of salts in ethylene carbonate
PERUZZI, NICCOLO';BAGLIONI, PIERO;LO NOSTRO, PIERANDREA
2011
Abstract
We measured the solubility of some potassium salts (KF, KCl, KBr, KI, KNO3, KClO4, KSCN, and KSeCN) in anhydrous ethylene carbonate (EC, see the figure) at different temperatures (between 20° and 60° C). EC is a polar organic solvent that possesses a significant permanent dipole moment (µ = 4.9 D) and a large relative dielectric constant (εr = 90).1 From the solubility data the main thermodynamic functions were calculated, and discussed in terms of solvation, solvent structuredness, and ion pair formation.2 The data indicate a significant specific anion effect that follows the direct Hofmeister series.3 Specific chemical interactions of EC molecules with thiocyanate and selenocyanate are reported. [1] Y. Chernyak, J. Chem. Eng. Data 2010, 51, 416-418. [2] Y. Marcus, J. Sol. Chem. 1992, 21, 1217-1230. [3] B.W. Ninham, P. Lo Nostro, Molecular Forces and Self Assembly. In Colloid, Nano Sciences and Biology. Cambridge University Press (Cambridge), 2010.
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