Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

Association of a solute can be followed by permittivity measurement which allows us in principle to calculate the equilibrium constant K and dipole moments of the monomer μ_M and dimer μ_D. However, the procedures used in the literature are unsatisfactory from the statistical point of view and the published values are mostly completely wrong. In all known examples their errors were badly underestimated. Using a correct statistical approach several examples have been now reevaluated. It is practically impossible to calculate reliably all three parameters from permittivity data of common accuracy. Better results are obtained if either μ_M or K can be determined in an independent way. A symmetrical structure of the dimer is preferable in several cases (acetic acid, 2-pyrrolidinenone) contrary to the previous claims.