Theoretically derived thermodynamic properties can be improved by the refinement of low-frequency modes against X-ray diffraction data

Herein, a framework for the estimation of the thermodynamic properties of molecular crystalsviathe refinement of frequencies from density functional theory calculations against X-ray diffraction data is presented. The framework provides an efficient approach to including the contribution of acoustic modes in the thermodynamic properties. The obtained heat capacities for urea, the α- and β-glycine polymorphs, benzoic acid, and 4′-hydroxyacetophenone are in good agreement with those from adiabatic calorimetry.