Lecture
This lecture covers the intramolecular and intermolecular electron delocalization in organic materials, focusing on the origin of pi-interactions, resonance structures, and the effects of substituents on electron density distribution. It also discusses the packing patterns of electron-rich and electron-poor conjugated systems, as well as the equilibrium t-stacking structure. The instructor explains the intermolecular forces between conjugated molecules and the importance of supramolecular packing for minimizing potential energy. By the end, students will understand the key concepts behind organic semiconductor materials and the design principles of organic electronic devices.