It is crucial to note that a low Pearson correlation coefficient does not imply that π -π stacking is inherently favourable. In fact, the low Pearson correlation coefficient for [5]- [7]helicenes suggests there is almost no correlation between π -π stacking and lattice energy and, thus, π -π interactions are neither favourable or unfavourable. Instead, in comparison to the higher Pearson correlation coefficients for other values of n, it suggests that π stacking is less unfavourable when the molecular shape is less uniform. This trend aligns with our initial observation of relatively fewer polymorphs in the CSP landscape for [6]helicene. The absence of a clear trend between π -π interactions and energy, i.e., the lack of these interactions predominately in higher energy crystals, suggests that other intermolecular interactions that typically stabilize the crystal structures for other [n]helicenes may be destabilised in [6]helicene. This observed trend may be the reason why chiral columns have been successfully synthesized experimentally in substituted [6]helicenes. Consequently, these trends could provide valuable insights into determining the helicene suitable for further polymorph studies or those whose derivatives may benefit from additional investigation.