Conductivity Studies of Tetrabutylammonium Salts in 1-propoxy-2-propanol: Ion-association in Dilute solutions
Bernhard Ramsauer, Monika M. Meier, Roland Neueder and Werner Kunz*
Department of Chemistry and Pharmacy, Institute of Physical and
Theoretical Chemistry, University of Regensburg, Germany *
Corresponding author: E-mail:
werner.kunz@chemie.uni-regensburg.de
Phone: +49 941 943 4044
Abstract
The molar conductivities Λ of n-tetrabutylammonium bromide, n-tetrabutylammonium
nitrate, n-tetrabutylammonium thiocyanate and n-tetrabutylammonium acetate
solutions in 1-propoxy-2-propanol (PnP) have been measured. The temperature and
concentration range covered is from 248.15 to 313.15 K and 0.18 × 10–3
to 6.4 × 10–3 mol L–1, respectively. Accurate viscosity, density and
permittivity data were additionally determined for the pure solvent. Data
analysis was performed on the basis of the low concentration Chemical Model (lcCM),
including short-range forces. Values for the limiting molar conductivities (Λ∞)
and the association constants KA are
derived. Thermodynamic results on the ion-pair formation process are discussed
in terms of coulombic and non-coulombic forces by an appropriate splitting of
the Gibbs free energy.
Keywords: Electrolyte conductivity, tetrabutylammonium salts, chemical model, permittivity, viscosity