Solubility of Pyrene in Organic Nonelectrolyte Solvents. Comparison of Observed Versus Predicted Values Based Upon Mobile Order Theory

Experimental solubilities are reported at 26.0°C for pyrene dissolved in twenty different organic nonelectrolyte solvents containing ether-, ester-, chloro-, hydroxy-, and methyl-functional groups. Results of these measurements, combined with our previously published pyrene solubility data in benzene, dibutyl ether, 1,4-dichlorobutane, 1-propanol, 2-propanol and saturated hydrocarbons, are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 30 solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable (though by no means perfect) estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is circa 79%. In comparison, the average absolute deviation increases significantly to 1380% when ideal solution behavior is assumed.