Abstract
Abstract The solubility of tris(pentane-2,4-dionato)chromium(III) (Cr(acac)3) in supercritical carbon dioxide (SC-CO2) with and without modifiers was investigated by UV–vis spectrophotometry. The influence of some polar and nonpolar modifiers, such as methanol, ethanol, 2,2,2-trifluoroethanol (TFE), acetone, chloroform, and benzene, was studied by changing the temperature, pressure, and concentration of the modifiers. Alcohols, particularly TFE, demonstrated a large solubility enhancement of Cr(acac)3 among these modifiers. In contrast, acetone having a relatively larger polarity gave a lower enhancement effect than chloroform and benzene. The measurement of the IR absorption spectra of TFE in the presence of Cr(acac)3 in SC-CO2 suggested that a drastic solubility enhancement of Cr(acac)3 upon the addition of TFE could be ascribed to the formation of the stable Cr(acac)3–TFE complex through hydrogen bonding. The association constants of Cr(acac)3 with TFE in SC-CO2 could be determined from the relationship of the solubility enhancement against the TFE concentration.
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