Determination of Individual Gibbs Energies of Anion Transfer and Excess Gibbs Energies Using an Electrochemical Method Based on Insertion Electrochemistry of Solid Compounds

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Antonio Domenech
  • Igor O. Koshevoy
  • Noemi Montoya
  • Antti Karttunen

  • Tapani A. Pakkanen

Research units

  • University of Valencia
  • University of Eastern Finland

Abstract

A method is presented to determine, individually and with minimal extra-thermodynamic assumptions, the Gibbs energy for anion transfer between two solvents using solid state electrochemistry of alkynyldiphosphine dinuclear Au(I) complexes (AuC(2)R)(2)PPh(2)C(6)H(4)PPh(2) (L1, R = Fc; L2, R = C(6)H(4)Fc) and the heterometallic Au(I)-Cu(I) [{Au(3)Cu(2)(C(2)R)(6)}Au(3)-(PPh(2)C(6)H(4)PPh(2))(3)](PF(6))(2) (L3, R = Fc; L4, R = C(6)H(4)Fc) cluster complexes containing ferrocenyl units. These compounds exhibit a well-defined, essentially reversible solid-state oxidation in contact with different electrolytes, based on ferrocenyl-centered oxidation processes involving anion insertion. Voltammetric data can be used for a direct measurement of the free energy of ion transfer from one solvent. to another using midpeak potentials in solutions of suitable salts in each one of the solvents separately or mixtures of the solvents. Excess Gibbs energy of solvation in solvent mixtures can also be directly measured using this procedure. Solvation data for different common inorganic oxoanions in water, MeOH, and MeCN and water-MeOH and water-MeCN mixtures are provided.

Details

Original languageEnglish
Pages (from-to)4577-4586
Number of pages10
JournalJournal of Chemical and Engineering Data
Volume56
Issue number12
Publication statusPublished - Dec 2011
MoE publication typeA1 Journal article-refereed

    Research areas

  • ELECTRONIC-STRUCTURE CALCULATIONS, ION-TRANSFER VOLTAMMETRY, HYDRATION FREE-ENERGY, NONAQUEOUS SOLVENTS, BASIS-SETS, THEORETICAL DETERMINATION, DIMETHYL-SULFOXIDE, SOLVATION ENERGY, 3-PHASE JUNCTION, POTENTIALS

ID: 6677060