Intermolecular Electron Delocalization

This lecture explores the concept of intermolecular electron delocalization in solid-state materials, focusing on the interaction of molecular orbitals and the resulting electronic coupling. The discussion covers the splitting of π MO, the lack of interaction between HOMO and LUMO due to opposite parity, and the decrease in HOMO-LUMO gaps. The instructor explains how intermolecular MO interactions are a consequence of interactions, not the reason for them, resulting in narrow intermolecular bands with low charge carrier mobilities. Various crystal structures of conjugated molecules are analyzed to illustrate the impact of stacking arrangements on electron delocalization and energy levels.