Key words: carbon dioxide, supercritical condition, solvatochromic parameters, dyes, polarity, donor-acceptor properties, temperature, pressure
Kamlet—Taft solvatochromic polarity parameters are determined for carbon dioxide in sub- and supercritical state at 22, 40, 60 and 80 °С and 10,0—30,0 MPa. As solvatochromic indicators, 2,6-di phenyl-4-(2,4,6-triphenyl-1-pyridino)-phenolate (Reichardt’s betaine) and benzophenone were used to determine ET, and to determine β and π parameters, respectively, 4-nitrophenol and 4-nitroanisole were used. It was found that the values of the parameters characterizing the polarity and donor-acceptor properties of CO2 are practically independent of the state parameters, since these properties are determined by the structure of the molecule.
doi:10.34984/SCFTP.2020.15.3.005