Experimental solubilities are reported for anthracene dissolved in binary solvent mixtures containing 1,4-dichlorobutane withn-heptane,n-octane, cyclohexane and methylcyclohexane at 25°C. Results of these measurements, combined with estimates for the excess Gibbs free energies of the binary solvents, are used to evaluate the equilibrium for a presumed anthracene-dichlorobutane molecular complex using the Extended NIBS model. The calculated equilibrium constant is compared to published values for anthracene-chlorobutane and pyrene-dichlorobutane. Differences in the values for the various polycyclic aromatic hydrocarbons (PAHs) and mono/dichlorobutanes are rationalized at the molecular level in terms of individual microscopic equilibrium constants for distinguishable association species.