Kristin A. Fletcher

Solubility of Thioxanthen-9-One in Organic Nonelectrolyte Solvents. Comparison of Observed Versus Predicted Values Based Upon Mobile Order Theory

Abstract Experimental solubilities are reported at 25.0°C for thioxanthen-9-one dissolved in thirty-five different organic nonelectrolyte solvents containing ester-, ether-, hydroxy-, methyl- and t-butyl-functional groups. Results of these measurements are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 26 solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable (although by no means perfect) estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is circa 45%. In comparison, the average absolute deviation increases significantly to 420% when ideal solution behavior is assumed.

Solubility of benzil in organic nonelectrolyte solvents. Comparison of observed versus predicted values based upon mobile order theory

Abstract Experimental solubilities are reported at 25.0 °C for benzil dissolved in twenty three different organic nonelectrolyte solvents containing ester–, ether–, chloro–, hydroxy– and methyl–functional groups. Results of these measurements combined with our previously published benzil solubility data in benzene, toluene, dibutyl ether, carbon tetrachloride 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 (although by no means perfect) estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is circa 31%. In comparison, the average absolute deviation increases significantly to 1500% when ideal solution behavior is assumed.

Solubility of thianthrene in organic nonelectrolyte solvents : Comparison of observed versus predicted values based upon mobile order theory

Abstract Experimental solubilities are reported at 25.0°C for thianthrene dissolved in twenty-one different organic nonelectrolyte solvents containing ether-, hydroxy-, and t-butyl-functional groups. Results of these measurements combined, with our previously published thianthrene solubility data in n-hexane, n-heptane, n-octanc, cyclohexane, methylcyc-lohexane, 2, 2, 4-trimethylpentane and cyclooctane, are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 20 solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable (although by no means perfect) estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is circa 58%. In comparison, the average absolute deviation increases significantly to 1,940% when ideal solution behavior is assumed.

Spectrochemical investigations of fluorescence quenching agents: Part 5. Effect of surfactants on the ability of nitromethane to selectively quench fluorescence emission of alternant PAHs

Applicability of the nitromethane selective quenching rule for discriminating between alternant vs. nonalternant polycyclic aromatic hydrocarbons (PAHs) is examined for 18 representative PAH solutes dissolved in micellar cetyltrimethylammonium chloride (CTACl), micellar dodecyltrimethylammonium bromide (DTAB), micellar Brij-35 and micellar sodium octanoate (SO) solvent media. Experimental results show that nitromethane quenched fluorescence emission of only the 10 alternant PAHs in the two cationic (CTACl and DTAB) and nonionic Brij-35 surfactant solvent media as expected. Emission intensities of nonalternant PAHs, except for the few exceptions noted previously, were unaffected by nitromethane addition. Unexpected quenching behavior was observed, however, in the case of nonalternant PAHs dissolved in micellar sodium octanoate solvent media. Nitromethane quenched fluorescence emission of all nonalternant PAHs studied in the SO solvent media, which is contrary to the selective quenching rule.