Heat capacities and derived thermodynamic functions of 1-octadecanol, 1-nonadecanol, 1-eicosanol, and 1-docosanol between 10 K and 370 K

The molar heat capacities of the linear alcohols 1-octadeeanol (C16H38O), 1-nonadecanol (C19H40O), 1-eicosanol (C20H42O), and 1-docosonol (C22H46O) were measured from 10 K to 370 K. The derived absolute entropies were fitted as a function of the carbon number (n) in the linear chain. At 360 K the function is S-o(360 K,n) = {117.52 + 38.328n} J.K-1. mol(-1). A simple function was found for the heat capacity of the liquids. From the melting point to 370 K the liquid heat capacities can be represented within the measuring error with C-p,C-1(n,T) = {-450.41 + 36.4968n + 1.47317T} J.K-1.mol(-1). The solid-solid phase transition in 1-octadecanol was investigated in more detail, and the relative Gibbs energy curves of both solid phases and the liquid phase are presented.