Continuing our investigation into PD parameter correlation with the nitrogen-lithium adsorption energy, the Kamlet-Taft π * (polarity) parameter on the other hand shows a moderate positive correlation (0.58) across all the states in Fig. . Being a measure of the polarity of the molecule, this suggests that PDs that are more polar result in less favorable nitrogen-lithium interactions. This observation aligns with our earlier hypothesis of an electrophilic attack on the nitrogen molecule to make it more electron deficient. Since highly polar molecules will possess more prominent electrophilic centers, we anticipate electrons would be pulled away from the nitrogen molecule to allow reduction by the lithium slab in this scenario. Indeed, as the Bader analysis in the previous section shows, nitrogen interaction in the embedded, buried, and standing states is accompanied by electron transfer onto one or both nitrogen atoms (fig. ). Thus, it is reasonable that PDs with stronger electron-withdrawing centers more easily facilitate this electron transfer.