About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
Journal of Physical Chemistry B
Paper
Diffusion of Decamethylferrocene and Decamethylferrocenium Hexafluorophosphate in Supercritical Trifluoromethane
Abstract
The diffusion coefficients of decamethylferrocene (Fe(Cp*) 2) and decamethylferrocenium hexafluorophosphate (Fe(Cp*) 2PF6) in supercritical trifluoromethane (CHF3) were measured at a temperature of 323.15 K, as a function of density, with tetrabutylammonium hexafluorophosphate (TBAPF6) as the supporting electrolyte, using a voltammetric technique on a platinum microelectrode. The diffusion in subcritical CHF3 was also studied, to analyze the differences in the behavior of both solutes in the low- and high-density regions. Application of the Oldham, Cardwell, Santos, and Bond theory allowed the effect of ion pairing on the limiting current to be considered. The density dependence of the diffusion coefficients of the different species has been discussed on the basis of the continuum hydrodynamic model and the clustering of solvent around solute molecules in the low-density supercritical region. The predictions of the compressible continuum model for the case of the diffusion of the free ions and the ion pair also have been discussed.