Thermochemical investigations of associated solutions. Part 14.—Calculation of anthracene–butyl acetate association parameters from measured solubility data

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Abstract
Experimental solubilities are reported for anthracene dissolved in binary solvent mixtures containing butyl acetate with n-hexane, n-heptane, n-octane, cyclohexane, methylcyclohexane and 2,2,4-trimethylpentane at 25.0 °C. Results of these measurements, combined with estimates for the excess Gibbs free energies of the binary solvents, are used to evaluate the equilibrium constant for a presumed anthracene–butyl acetate molecular complex from the extended nearly ideal binary solvent model. A single association constant was needed to describe the experimental data to within an average deviation of 2%. The numerical value of the calculated constant varied slightly with inert hydrocarbon cosolvent, ranging from Kϕ AC= 4.5 in 2,2,4-trimethylpentane to an upper value of Kϕ AC= 8.0 in both cyclohexane and methylcyclohexane cosolvents.

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