m , where r is the distance between ions and V m is the molecular volume. We extend this understanding of interactions in the solid phase from ionic compounds to molecular solids. As Coulomb forces dominate ionic interactions, we expect dipole-dipole interactions to dominate intermolecular interactions for quinone and hydroquinone solids, due to the carbon-oxygen bonds. It can be derived from quantum mechanics that dipoledipole interactions scale with distance as r -3 or V -1 m . Similarly, Van der Waals (VdW) interactions scale with distance as r -6 or V -2 m . We hypothesize that the lattice energy of our quinone and hydroquinone solids is well described by the dipole-dipole interaction due to the abundance of oxygen-based functional groups and aromatic rings on the molecules.