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 {CH3(CH2)nCH3} normal paraffins, {COH(CH2)nCOH} diols, {CH3(CH2)nCOH} normal alcohols, and {CH3(CH2)nCOOH} saturated carboxylic and {COOH(CH2)nCOOH} dicarboxylic acids enabled the comparative analysis of phase transition parameters.