Habit of long-chain molecular crystals

The quantitative analysis of the temperature dependence of the heat capacity of molecular crystals with chains of different lengths was performed using the theory of diffuse first-order phase transitions. The same chemical structure of the “core” of molecular crystals of $\{$CH$_{3}$(CH$_{2})_{n}$CH$_{3}\}$ normal paraffins, $\{$COH(CH$_{2})_{n}$COH$\}$ diols, $\{$CH$_{3}$(CH$_{2})_{n}$COH$\}$ normal alcohols, and $\{$CH$_{3}$(CH$_{2})_{n}$COOH$\}$ saturated carboxylic and $\{$COOH(CH$_{2})_{n}$COOH$\}$ dicarboxylic acids enabled the comparative analysis of phase transition parameters.