Enthalpies of solution of C-alkylresorcin[4]arenes in alcohols at T = 298.15 K

• The enthalpies of solution of C-alkylresorcin[4]arenes in alcohols were measured.
• The character exothermic or endothermic do not vary monotonically.
• Transfer enthalpies were calculated and solvation enthalpies were estimated.

Enthalpies of solution of five C-alkylresorcin[4]arenes (alkyl = ethyl, n-butyl, n-pentyl or n-hexyl) in methanol, ethanol and propanol as a function of molal concentration were measured by semiadiabatic calorimetry at T = 298.15 K. The enthalpies at infinite dilution and the enthalpies of transfer from propanol were calculated. The enthalpies of solvation were estimated and their values are negative. The (solute + solvent) interactions between C-ethylresorcin[4]arene, C-butylresorcin[4]arene, and C-pentylresorcin[4]arene and alcohols are principally determined by van der Waals interactions, whereas hydrogen bonds are the predominate factor in alcoholic solutions of C-methylresorcin[4]arene and C-hexylresorcin[4]arene.