| Solvatochromic shifts of seven probe indicators {lcub}4-nitroaniline, 4-nitroanisole, 4-nitrophenol, N,N-dimethyl-4-nitroaniline, N,N-dimethyl-4-nitrosoaniline, 4-(2,4,6-triphenylpyridinium)-2,6-diphenylphenoxide and 2,6-dichloro-4-(2,4,6-triphenyl-1-pyridinio)phenolate{rcub} have been measured in binary mixtures of carbon dioxide with acetone and methanol at 35°C and 40°C over the entire range of solvent composition. The indicators were used to specify the solvatochromic solubility parameters E T(30), α, β, and π* which were calculated from the solvatochromic shifts of the maximum absorbance peak (vmax) observed by means of UV/Vis spectroscopy.; The UV-Vis data was then taken and applied to the theories of preferential solvation on the binary solvent mixtures. The data was analyzed to determine if the differences between the bulk and local compositions of the binary mixtures had an effect on the solvatochromic shifts and thus the trends observed for the solvatochromic parameters (ET(30), α, β, and π*) as determined in part one of this project. |
