Energetics of molecular interactions of 1,4-dioxane with formamides or anilines at 308.15K

Abstract

Molar excess enthalpies (H E) of 1,4-dioxane (A)+aniline or formamide or N, N-dimethylaniline or N, N-dimethylformamide (B) mixtures have been measured at 308.15K over the entire composition range using flow isothermal micro calorimeter. The H E values for 1,4-dioxane+N, N-dimethylaniline or N, N-dimethylformamide were found to be small and positive and, these are large and negative for mixture containing aniline, whereas these change sign from negative to positive for 1,4-dioxane+formamide. The H E versus mole fraction of 1,4-dioxane (x A) plots for 1,4-dioxane (A)+aniline or N, N-dimethylaniline or N, N-dimethylformamide (B) system are symmetrical about x A=0.5 and for equimolar mixtures, H E for these system follow the sequence: aniline<formamide<N, N-dimethylaniline<N, N-dimethylformamide. The excess enthalpy data have been utilized to study the energetics of molecular interactions in terms of graph theoretical approach. © 2011 The Korean Society of Industrial and Engineering Chemistry.