Figure 2.

Amide-aromatic Interactions: Interactions of Alkyl Ureas with Naphthalene and Anthracene by Solubility Assays at 25°C. The negative logarithm of the solubility of the aromatic hydrocarbon ( $m_2^{\mathit{\text{ss}}}$) , normalized by its extrapolated molal solubility in the absence of solute ( $m_{2,0}^{\mathit{\text{ss}}}$) is plotted versus alkyl urea molality m₃ and fit to a linear or quadratic equation as shown to obtain μ₂₃ from the initial slope (see Equation 2). Solubility data quantifying interactions of naphthalene with four additional amides are shown in Supplemental Figure S5.