Solubility of Solid Ferrocene in Pressurized Hot Water

Aqueous solubilities of ferrocene (bis(cyclopentadienyl)iron(II), C 10 H 10 Fe) were measured at temperatures within (313 to 433) K along a 5 MPa isobar. The activity coefficients of ferrocene in aqueous solutions at saturation were obtained employing three different approximations of the solute heat capacity difference, Δ C P 2 . The relative rate of increase in aqueous solubility of ferrocene with temperature, (∂ ln x 2 /∂ T ) P,σ, is distinctly lower than the corresponding values in aromatic hydrocarbons naphthalene (C 10 H 8 ) and anthracene (C 14 H 10 ) possibly because of less endothermic solute−water interactions because of less contact surface of the ferrocene molecule.