Binary Diffusion Coefficients of Platinum(II) Acetylacetonate in Supercritical Carbon Dioxide

Binary diffusion coefficients (D₁₂) and retention factors (k) of platinum(II) acetylacetonate at infinitesimal concentration in supercritical (sc) carbon dioxide (CO₂) were measured by the chromatographic impulse response method with a poly(ethylene glycol) coated capillary column at temperatures from (308.15 to 343.15) K and pressures from (8.5 to 40.0) MPa, and D₁₂ in liquid ethanol at temperatures from (298.15 to 333.15) K and atmospheric pressure by the Taylor dispersion method. As has been seen for our previously reported data on other metal complexes measured in sc CO₂ and organic solvents, the D₁₂ data in sc CO₂ and liquid ethanol were represented by a function of temperature and solvent viscosity. The D₁₂ values for metal complexes were not related to the solute molecular weights. The k values in sc CO₂ were expressed by a function of temperature and CO₂ density.